Geometry Review, Classify Triangles and Angle Relationships

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of a triangle and the extension of an adjacent side. The measure of an exterior angle is equal to the sum of the measures of the two non-adjacent interior angles.

Front

How do you classify triangles based on their angles?

Back

Triangles can be classified as acute (all angles less than 90°), right (one angle exactly 90°), or obtuse (one angle greater than 90°).

Front

What is an obtuse triangle?

Back

An obtuse triangle is a triangle that has one angle measuring more than 90 degrees.

Front

True or False: An obtuse triangle has 1 obtuse angle.

Back

True.

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

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 opposite interior angles.

Front

What is an acute triangle?

Back

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

Front

What is a right triangle?

Back

A right triangle is a triangle that has one angle measuring exactly 90 degrees.

Front

If one angle of a triangle is 100 degrees, what type of triangle is it?

Back

It is an obtuse triangle because it has one angle greater than 90 degrees.

Front

What is the relationship between the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.