Interior and Exterior Angles of Triangles

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of a triangle and the extension of an adjacent side. It is equal to the sum of the two remote interior angles.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

Define remote interior angles in relation to an exterior angle.

Back

Remote interior angles are the two interior angles of a triangle that are not adjacent to a given exterior angle.

Front

What is an interior angle of a triangle?

Back

An interior angle is formed by two sides of a triangle and is located inside the triangle.

Front

If one angle of a triangle is 50 degrees and another is 60 degrees, what is the third angle?

Back

The third angle is 70 degrees (180 - 50 - 60 = 70).

Front

What is the relationship between an exterior angle and its adjacent interior angle?

Back

The exterior angle is equal to the sum of the two remote interior angles, and it is supplementary to the adjacent interior angle.

Front

How do you calculate the measure of an unknown angle in a triangle?

Back

To find an unknown angle, subtract the sum of the known angles from 180 degrees.

Front

What is the definition of corresponding angles?

Back

Corresponding angles are pairs of angles that are in similar positions at each intersection where a straight line crosses two others.

Front

What is the difference between acute, obtuse, and right angles?

Back

Acute angles are less than 90 degrees, right angles are exactly 90 degrees, and obtuse angles are greater than 90 degrees but less than 180 degrees.

Front

If the exterior angle of a triangle is 120 degrees, what is the sum of the remote interior angles?

Back

The sum of the remote interior angles is 120 degrees.