7th Flashcard: 9.4-9.5

Front

What are vertical angles?

Back

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

Front

What is the formula for the area of a circle?

Back

A = πr², where r is the radius of the circle.

Front

What are complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What are supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

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

If ∠1 and ∠3 are vertical angles, what can we say about their measures?

Back

The measures of ∠1 and ∠3 are equal.

Front

What is the value of x if 2x + 3 = 25?

Back

x = 11.

Front

If two angles are complementary and one angle measures 30 degrees, what is the measure of the other angle?

Back

The other angle measures 60 degrees.

Front

What is the relationship between the angles in a linear pair?

Back

Angles in a linear pair are supplementary, meaning they add up to 180 degrees.

Front

What is the measure of each angle in a right angle?

Back

Each angle in a right angle measures 90 degrees.