# Why Are Same Side Interior Angles Always Supplementary?

## What do alternate interior angles look like?

Alternate Interior Angles are a pair of angles on the inner side of each of those two lines but on opposite sides of the transversal.

In this example, these are two pairs of Alternate Interior Angles: c and f..

## Are alternate interior angles congruent or supplementary?

Alternate interior angles are congruent. Consecutive interior angles are supplementary. Consecutive interior angles are interior angles which are on the same side of the transversal line. Alternate interior angles don’t have any specific properties in the case of non – parallel lines.

## Are same side exterior angles always supplementary?

Lesson Summary Two angles that are exterior to the parallel lines and on the same side of the transversal line are called same-side exterior angles. The theorem states that same-side exterior angles are supplementary, meaning that they have a sum of 180 degrees.

## What does alternate interior angles mean?

: one of a pair of angles with different vertices and on opposite sides of a transversal at its intersection with two other lines: a : one of a pair of angles inside the two intersected lines. — called also alternate interior angle.

## Are corresponding angles always congruent?

All angles that are either exterior angles, interior angles, alternate angles or corresponding angles are all congruent. The picture above shows two parallel lines with a transversal.

## Do alternate interior angles add up to 180?

Alternate angles form a ‘Z’ shape and are sometimes called ‘Z angles’. … d and f are interior angles. These add up to 180 degrees (e and c are also interior). Any two angles that add up to 180 degrees are known as supplementary angles.

## Why are same side interior angles always supplementary whenever lines are parallel?

The same-side interior angles theorem states that same-side interior angles are supplementary when the lines intersected by the transversal line are parallel. 2) Since the lines A and B are parallel, the same-side interior angles theorem states that same-side interior angles will be supplementary.

## Do same side interior angles have the same measure?

Same-side interior angles are NOT always congruent. In fact, the only time they are congruent (meaning they have the same measure) is when the…

## What are interior angles on the same side of transversal?

When a transversal intersects two lines, the two lines are parallel if and only if interior angles on the same side of the transversal and exterior angles on the same side of the transversal are supplementary (sum to 180°).

## What are same side interior angles called?

The pairs of angles on one side of the transversal but inside the two lines are called Consecutive Interior Angles.

## Can two angles be supplementary if both of them are acute?

∴Sum of two acute angles cannot make a supplementary angle. As we know that obtuse angle is always greater than 900. … So, the sum of two right angles is always equal to 1800.

## What is the definition of interior angles?

an angle formed between parallel lines by a third line that intersects them. an angle formed within a polygon by two adjacent sides.

## What is the difference between alternate interior angles and same side interior angles?

One of corresponding angles is always interior (in between parallel lines) and another – exterior (outside of the area in between parallel lines). Two acute angles a and c’ , formed by different parallel lines when intersected by a transversal, lying on the opposite sides from a transversal, are called alternate.

## When two parallel lines are cut by a transversal are same side interior angles ever congruent?

If two parallel lines are cut by a transversal, the corresponding angles are congruent. If two lines are cut by a transversal and the corresponding angles are congruent, the lines are parallel. Interior Angles on the Same Side of the Transversal: The name is a description of the “location” of the these angles.

## When two parallel lines are cut by a transversal same side interior angles are supplementary?

If two lines are cut by a transversal so the consecutive interior angles are supplementary, then the lines are parallel. If two lines are parallel to the same line, then they are parallel to each other. Lines m and n are parallel when the marked consecutive interior angles are supplementary.