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 are Vertical Angles?

Back

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

Front

What are Alternate Interior Angles?

Back

Alternate interior angles are pairs of angles that lie on opposite sides of a transversal and inside two parallel lines. They are equal.

Front

What are Supplementary Angles?

Back

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

Front

What is an Acute Angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is an Obtuse Angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

What is a Right Angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is a Straight Angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

How do you determine if triangles are similar?

Back

Triangles are similar if their corresponding angles are equal and their corresponding sides are in proportion.

Front

What is the measure of the third angle in a triangle if two angles measure 50 degrees and 60 degrees?

Back

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