Triangle Sum Theorem

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 measures 90°, 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 45° and 60°?

Back

75°

Front

How do you find the measure of a missing angle in a triangle?

Back

Subtract the sum of the known angles from 180°.

Front

Can a triangle have angles measuring 150°, 110°, and 100°?

Back

No, because the sum exceeds 180°.

Front

What is the measure of the third angle in a triangle with angles measuring 34° and 101°?

Back

45°

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle where all three angles are equal, each measuring 60°.

Front

What is an isosceles triangle?

Back

An isosceles triangle has at least two sides that are equal in length, and the angles opposite those sides are equal.

Front

What is a scalene triangle?

Back

A scalene triangle has all sides of different lengths and all angles of different measures.

Front

If a triangle has angles measuring 90°, 45°, and 45°, what type of triangle is it?

Back

It is an isosceles right triangle.