Angles of a Triangle

Front

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

Back

The sum of the interior angles of a triangle is always 180°.

Front

What are the possible angle measures for a triangle?

Back

The measures of the angles in a triangle must be positive and their sum must equal 180°.

Front

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

Back

It is a right triangle.

Front

What is an acute triangle?

Back

An acute triangle is a triangle where all three angles are less than 90°.

Front

What is an obtuse triangle?

Back

An obtuse triangle is a triangle that has one angle greater than 90°.

Front

How do you find the missing angle in a triangle?

Back

To find the missing angle, subtract the sum of the known angles from 180°.

Front

What is the relationship between the angles in a triangle and the sides?

Back

In a triangle, the larger the angle, the longer the opposite side.

Front

What is the formula for finding the exterior angle of a triangle?

Back

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

Front

How can you determine if three angles can form a triangle?

Back

Three angles can form a triangle if their sum is exactly 180° and each angle is greater than 0°.

Front

What is the value of x if two angles of a triangle are 50° and 80°?

Back

x = 50° (since 180° - (50° + 80°) = 50°).