Triangle Sum/Exterior Angle

Front

What is the Triangle Sum Theorem?

Back

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

Front

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

Back

It is a right triangle.

Front

What is the measure of the third angle in a triangle if the first two angles are 34 degrees and 101 degrees?

Back

45 degrees.

Front

What is the formula to find the measure of an exterior angle of a triangle?

Back

The exterior angle is equal to the sum of the two opposite interior angles.

Front

If two angles of a triangle are 30 degrees and 70 degrees, what is the measure of the third angle?

Back

80 degrees.

Front

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

Back

Each exterior angle is equal to the sum of the two non-adjacent interior angles.

Front

How do you find the value of x in a triangle when given two angles?

Back

Subtract the sum of the two angles from 180 degrees.

Front

What is an acute triangle?

Back

A triangle where all three angles are less than 90 degrees.

Front

What is an obtuse triangle?

Back

A triangle where one angle is greater than 90 degrees.

Front

What is a scalene triangle?

Back

A triangle where all three sides and all three angles are different.