Triangle Interior & Exterior Angles

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

What is an exterior angle of a triangle?

Back

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

Front

How do you find the measure of an exterior angle?

Back

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

Front

What is a remote interior angle?

Back

A remote interior angle is an interior angle of a triangle that is not adjacent to a given exterior angle.

Front

If one angle of a triangle is 50 degrees and another is 60 degrees, what is the third angle?

Back

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

Front

What is the relationship between corresponding angles when two parallel lines are cut by a transversal?

Back

Corresponding angles are equal when two parallel lines are cut by a transversal.

Front

What is the definition of an interior angle?

Back

An interior angle is an angle formed inside a triangle by two sides.

Front

If the exterior angle is 120 degrees, what is the measure of the remote interior angles?

Back

The sum of the remote interior angles is 120 degrees.

Front

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

Back

The formula is: Missing angle = 180 - (sum of the other two angles).

Front

What is the difference between acute, obtuse, and right angles?

Back

Acute angles are less than 90 degrees, obtuse angles are greater than 90 degrees but less than 180 degrees, and right angles are exactly 90 degrees.