Triangle Theorem Practice

Front

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

Back

180 degrees.

Front

What is the definition of an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is the definition of a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is the definition of an obtuse angle?

Back

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

Front

What does the Triangle Inequality Theorem state?

Back

The sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

Front

If two angles of a triangle are equal, what type of triangle is it?

Back

It is an isosceles triangle.

Front

What is the definition of a scalene triangle?

Back

A triangle with all sides of different lengths.

Front

What is the definition of a triangle's exterior angle?

Back

An angle formed by one side of a triangle and the extension of an adjacent side.

Front

According to the Exterior Angle Theorem, what can be said about an exterior angle and the two opposite interior angles?

Back

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

Front

What is the longest side of a triangle called?

Back

The hypotenuse (in a right triangle) or simply the longest side.