Area of Circles

If the area of a circle is 25 π in² , then the diameter is?

• 10 in

• 5 in

• 25 in

• pi in

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

A baker is making a giant pizza with a diameter of 42 inches. a large jar of tomato sauce can cover 90 square inches of pizza. How many jars of tomato sauce does the baker need to buy to cover all the pizza?

Mathematical Equivalence

ON

what is the formula for finding area of a circle

• C = π r²

• A = π r²

• A = π r² / 2

• C = 2 π r

Find the radius of the circle

• 20 ft

• 10 ft

• 5.5 ft

• 10

find the radius of the circle

• 3 m

• 1.5 m

• 1.5

• 1.5 mm

what is the formula for finding the area of a semi-circle

• A = π r²

• C = π r²

• A = π r² / 2

• A = 2 π r

what is the radius of the inner circle?

• 12 in

• 8 in

• 8 ft

• 4 in