Geo Ch 1.8 Exterior <, Triangle Sum, Quadrilateral Sum

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 value of the third angle in a triangle if the other two angles are 50 degrees and 60 degrees?

Back

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

Front

Define an isosceles triangle.

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Front

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

Back

The sum of the interior angles of a quadrilateral is 360 degrees.

Front

If two angles of a quadrilateral are 90 degrees each, what is the sum of the other two angles?

Back

The sum of the other two angles is 180 degrees (360 - 90 - 90 = 180).

Front

What is the Exterior Angle Theorem?

Back

The Exterior Angle Theorem states that the measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles.

Front

If one exterior angle of a triangle is 120 degrees, what is the sum of the two non-adjacent interior angles?

Back

The sum of the two non-adjacent interior angles is 120 degrees.

Front

How do you classify a triangle with sides of lengths 3, 4, and 5?

Back

It is a scalene triangle because all sides are of different lengths.

Front

What is the formula to find the measure of an interior angle of a regular polygon?

Back

The formula is (n-2) * 180/n, where n is the number of sides.