Triangle Sum & Exterior Angle 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 two angles of a triangle are 70 degrees and 50 degrees, what is the measure of the third angle?

Back

The third angle is 60 degrees, calculated as 180 - (70 + 50).

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 opposite interior angles.

Front

If one interior angle of a triangle is 40 degrees and another is 60 degrees, what is the measure of the exterior angle adjacent to the 60-degree angle?

Back

The exterior angle is 100 degrees, calculated as 40 + 60.

Front

What is the formula to find the missing angle in a triangle?

Back

The formula is: Missing Angle = 180 - (Angle 1 + Angle 2).

Front

In a triangle, if one angle measures 90 degrees, what type of triangle is it?

Back

It is a right triangle.

Front

What is the relationship between the angles in an isosceles triangle?

Back

In an isosceles triangle, the two angles opposite the equal sides are equal.

Front

If a triangle has angles measuring 45 degrees, 45 degrees, and x degrees, what is the value of x?

Back

x is 90 degrees, calculated as 180 - (45 + 45).

Front

How do you find the measure of an angle when given the other two angles in a triangle?

Back

Subtract the sum of the two known angles from 180 degrees.

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.