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## What are the two lines and the transversal that form the pair?

When two lines are cut by a transversal, the pairs of angles on either side of the transversal and inside the two lines are called the alternate interior angles . If two parallel lines are cut by a transversal, then the alternate interior angles formed are congruent .

## Which of the following pair is a pair of interior angles formed by two parallel lines and on the same side of the transversal?

Answer. When the lines are parallel, the interior angles on the same side of the transversal are supplementary. If two parallel lines are cut by a transversal, the interior angles on the same side of the transversal are supplementary.

## Which of these are a pair of same side interior angles?

Same-side interior angles are a pair of angles on one side of a transversal line, and on the inside of the two lines being intersected. Angles 4 and 5, indicated in green, are also same-side interior angles. And line t is the transversal line intersecting lines a and b.

## How many pairs of interior angles are formed by two lines and a transversal?

When a transversal intersects with two parallel lines eight angles are produced. The eight angles will together form four pairs of corresponding angles. Angles 1 and 5 constitutes one of the pairs. Corresponding angles are congruent.

## How do you prove two lines are parallel?

If two parallel lines are cut by a transversal, then corresponding angles are congruent. If two lines are cut by a transversal and corresponding angles are congruent, then the lines are parallel.

## What are two parallel lines cut by a transversal?

If two parallel lines are cut by a transversal, then, Alternate Exterior Angles are congruent. If two parallel lines are cut by a transversal, then corresponding angles are congruent. Two lines cut by a transversal are parallel IF AND ONLY IF corresponding angles are congruent.

## What happens if a transversal intersects two parallel lines?

If a transversal intersects two parallel lines, then corresponding angles are congruent. If a transversal intersects two parallel lines, then alternate interior angles are congruent. If two lines and a transversal form same-side exterior angles that are supplementary, then the two lines are parallel.

## Which angles are equal in parallel lines?

Angles in parallel lines

• When a pair of parallel lines is cut with another line known as an intersecting transversal, it creates pairs of angles with special properties.
• Corresponding angles are equal. The lines make an F shape.
• Alternate angles are equal. The lines make a Z shape which can also be back to front.

## How do you find the measure of an angle in an equation?

The equation to use is: angle A + angle B + angle C = 180-degrees. For example, say you have the following triangle.

## How do you find the measure of an angle in a triangle?

How To Find The Angle of a Triangle

1. Subtract the two known angles from 180° .
2. Plug the two angles into the formula and use algebra: a + b + c = 180°

## What is angle sum of a triangle?

Angles in a triangle sum to 180° proof.

180 °

180°

## Which set of angles can form a triangles?

Answer: Any set of three angles that add up to 180 degrees can form a triangle. Step-by-step explanation: A triangle is a polygon formed by three segments which each line intersects with the other lines.

## Do all triangles equal 180 degrees?

The answer is yes! To mathematically prove that the angles of a triangle will always add up to 180 degrees, we need to establish some basic facts about angles. The first fact we need to review is the definition of a straight angle: A straight angle is just a straight line, which is where it gets its name.

## Why do triangles equal 180?

A triangle’s angles add up to 180 degrees because one exterior angle is equal to the sum of the other two angles in the triangle. In other words, the other two angles in the triangle (the ones that add up to form the exterior angle) must combine with the third angle to make a 180 angle.

## Can a triangle have two right angles?

No, a triangle can never have 2 right angles. A triangle has exactly 3 sides and the sum of interior angles sum up to 180°. Thus, it is not possible to have a triangle with 2 right angles.

## What are the six types of triangles?

The six types of triangles are: isosceles, equilateral, scalene, obtuse, acute, and right.

• An isosceles triangle is a triangle with two congruent sides and one unique side and angle.
• An equilateral triangle is a triangle with three congruent sides and three congruent angles.

## What are the 7 types of triangle?

To learn about and construct the seven types of triangles that exist in the world: equilateral, right isosceles, obtuse isosceles, acute isosceles, right scalene, obtuse scalene, and acute scalene.

## What is a tall triangle called?

Equilateral triangle

## What are the 5 types of triangles?

• Equilateral triangle. The Equilateral triangleshown on the left has three congruent sides and three congruent angles.
• Isosceles triangle. The Isosceles triangle shown on the left has two equal sides and two equal angles.
• Scalene Triangle. The Scalene Triangle has no congruent sides.
• Acute Triangle.
• Obtuse Triangle.

## How do you classify triangles?

Triangles can be classified either according to their sides or according to their angles. All of each may be of different or the same sizes; any two sides or angles may be of the same size; there may be one distinctive angle.

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## What are the two lines and the transversal that form the pair?

When two lines are cut by a transversal, the pairs of angles on either side of the transversal and inside the two lines are called the alternate interior angles . If two parallel lines are cut by a transversal, then the alternate interior angles formed are congruent .

## Which of the following pair is a pair of interior angles formed by two parallel lines and on the same side of the transversal?

Answer. When the lines are parallel, the interior angles on the same side of the transversal are supplementary. If two parallel lines are cut by a transversal, the interior angles on the same side of the transversal are supplementary.

## Which of these are a pair of same side interior angles?

Same-side interior angles are a pair of angles on one side of a transversal line, and on the inside of the two lines being intersected. Angles 4 and 5, indicated in green, are also same-side interior angles. And line t is the transversal line intersecting lines a and b.

## How many pairs of each type of angles do two lines and a transversal form?

When a transversal intersects with two parallel lines eight angles are produced. The eight angles will together form four pairs of corresponding angles.

## What is a zero angle?

A zero angle (0°) is an angle formed when both the angle’s arms are at the same position. Illustration: ∠ RPQ = 0° (zero angle) Acute Angle. An acute angle is an angle that is more than 0° but less than 90°.

2

## What is a common angle?

Two angles are Adjacent when they have a common side and a common vertex (corner point) and don’t overlap. they have a common vertex (point B)

## What is the measure of a complete angle?

Angles larger than a straight angle but less than 1 turn (between 180° and 360°) are called reflex angles. An angle equal to 1 turn (360° or 2π radians) is called a full angle, complete angle, round angle or a perigon.

## What is the common angle theorem?

If two angles adjacent to a common angle are congruent, then the overlapping angles formed are congruent.

## What is the measure of straight angle?

A straight line is 180 degrees, or a “straight” angle.

## What is a straight line angle called?

Two joining rays make an angle. When the arms of the angle lie in the opposite direction, they form a straight angle. The angles make a straight line through the vertex. A straight angle is also called ‘flat angle’.

## What is a full circle angle called?

The Full Circle A Full Circle is 360° Half a circle is 180° (called a Straight Angle) Quarter of a circle is 90° (called a Right Angle)

## Is a straight angle always 180 degrees?

A straight angle is exactly 180 degrees and is composed of exactly one line with no changes in vector. Additionally, any two contiguous angles must be supplementary or equal 180 degrees. A line perpendicular to a straight angle forms two right angles.

## What is an angle that is 180 degrees called?

Angles between 90 and 180 degrees (90°< θ <180°) are known as obtuse angles. Angles that are 180 degrees (θ = 180°) are known as straight angles. • Angles between 180 and 360 degrees (180°< θ < 360°) are called reflex angles.

## What type of angles add up to 180 degrees?

Two angles are called complementary when their measures add to 90 degrees. Two angles are called supplementary when their measures add up to 180 degrees.

## What are the 4 types of angles?

Angles: Acute, Obtuse, Straight and Right There are four types of angles depending on their size in degrees

## Do same side interior angles add up to 180?

The “same side interior angle theorem” states: If a transversal intersects two parallel lines, each pair of same side interior angles are supplementary (their sum is 180∘ ).

## What are f angles called?

Corresponding angles These are sometimes known as ‘F’ angles. The diagram below shows parallel lines being intersected by another line. The two angles marked in this diagram are called corresponding angles and are equal to each other. The two angles marked in each diagram below are called alternate angles or Z angles.

## What is the F rule in angles?

Angles of Parallel Lines

NAME RULE
Corresponding angles (F shape)
Co-interior angles Add to 180 degrees (U shape)
Alternate angles Equal (Z shape)

## How do you show parallel lines?

If two parallel lines are cut by a transversal, then corresponding angles are congruent. If two lines are cut by a transversal and corresponding angles are congruent, then the lines are parallel.

## What is the Z rule?

Alternate angles form a ‘Z’ shape and are sometimes called ‘Z angles’. a and b are adjacent angles. Adjacent angles add up to 180 degrees. (d and c, c and a, d and b, f and e, e and g, h and g, h and f are also adjacent).

## Why are all triangles 180 degrees?

A triangle’s angles add up to 180 degrees because one exterior angle is equal to the sum of the other two angles in the triangle. In other words, the other two angles in the triangle (the ones that add up to form the exterior angle) must combine with the third angle to make a 180 angle.

## What angles add up to 360?

The General Rule

Shape Sides Sum of Interior Angles
Triangle 3 180°