Circles PSAT Review

A _____ is half of a circle.

• circumference

• pi

• semicircle

•  composite figure

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2

• Divide the diameter by 2

• Add 2 to the diameter

• Subtract 2 from the diameter

Which segment is the diameter?

• AC

• BD

• LM

• CE

Which segment is a radius?

• LM

• DC

• BD

• ML

If the area of circle is 100 π , find the radius of the circle.

• 10 π

• 10

• 50

• 50 π

The definition of a circle is

• set of all points in a plain that are the same distance from a point called the center

• the distance around a share

• a large figure

• a pizza, orange, plum, or watermelon

The definition of radius is

• distance from one point to another point

• distance around the circle

• distance from the center to any point on the circle

• distance across the circle through the center

The definition of diameter is

• distance from the center of any point on the circle

• distance across the circle through the center

• distance from one point to another

• distance around the circle

The definition of circumference is

• distance from the center of any point on the circle

• distance from one point to another

• distance around the circle

• distance from the center of any point on the circle

what is the formula for finding radius

• c = π d

• c = 2 π r

• d = r/2

• r = d/2