Angles in Triangles

Front

What are the three types of angles in a triangle?

Back

Acute angles (less than 90°), right angles (exactly 90°), and obtuse angles (greater than 90°).

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 degrees.

Front

Define remote interior angles in relation to an exterior angle.

Back

Remote interior angles are the two angles inside the triangle that are not adjacent to a given exterior angle.

Front

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

Back

It is a right triangle.

Front

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

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the relationship between the angles in a triangle and the exterior angle?

Back

The measure of an exterior angle is equal to the sum of the two remote interior angles.

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 measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

How can you determine if a triangle is valid based on its angles?

Back

The sum of the angles must equal 180 degrees, and each angle must be greater than 0 degrees.

Front

What is the formula to calculate the third angle if two angles are known?

Back

Third angle = 180 - (first angle + second angle).