Chapter 7 Review

Front

What are adjacent angles?

Back

Adjacent angles are two angles that share a common side and a common vertex, but do not overlap.

Front

What are vertical angles?

Back

Vertical angles are the angles opposite each other when two lines intersect. They are always equal.

Front

If m∠1 = 30°, what is m∠3 if they are vertical angles?

Back

m∠3 = 30° because vertical angles are equal.

Front

How do you classify a triangle with angles measuring 40°, 100°, and 40°?

Back

It is an obtuse isosceles triangle because it has one obtuse angle and two equal angles.

Front

What is the sum of the angles in a triangle?

Back

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

Front

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

Back

It is a right triangle.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90° but less than 180°.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90°.

Front

If two angles are adjacent and one measures 86°, what is the measure of the other angle if they are supplementary?

Back

The other angle measures 94° because supplementary angles sum to 180°.

Front

What is the measure of the missing angle if one angle is 55° in a triangle?

Back

The missing angle can be found by subtracting the sum of the known angles from 180°.