Triangle Angle Sum and Exterior Angles

Front

What is the Triangle Angle Sum Theorem?

Back

The Triangle Angle Sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.

Front

What is an Exterior Angle of a triangle?

Back

An Exterior Angle of a triangle is formed by one side of the triangle and the extension of an adjacent side. It is equal to the sum of the two opposite interior angles.

Front

What are Remote Interior Angles?

Back

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

Front

What is the measure of each angle in an equilateral triangle?

Back

In an equilateral triangle, each angle measures 60 degrees.

Front

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

Back

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

Front

What are Vertical Angles?

Back

Vertical Angles are the angles opposite each other when two lines intersect. They are always equal.

Front

What are Corresponding Angles?

Back

Corresponding Angles are pairs of angles that are in similar positions at each intersection where a straight line crosses two others. They are equal when the lines are parallel.

Front

What are Supplementary Angles?

Back

Supplementary Angles are two angles whose measures add up to 180 degrees.

Front

What is the relationship between the angles in a triangle and its exterior angle?

Back

The exterior angle of a triangle is equal to the sum of the two remote interior angles.

Front

If one angle of a triangle is 90 degrees, what type of triangle is it?

Back

It is a right triangle.