Circles Test Applications

what is the formula for finding area of a circle

• C = π r²

• A = π r²

• A = π r² / 2

• C = 2 π r

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

what is the diameter of the inner circle

• 16 in

• 12 in

• 4 in

• 8 ft

What is the circumference of this circle? Use the pi button on your calculator and round to the nearest whole number.

• A

• B

• C

• D

What is the area of this circle? Use the pi button on your calculator and round to the nearest whole number.

• A

• B

• C

• D

Solve for the missing angle.

• 45^o

• 90^o

• 22.5^o

• 128^o

Find the length of the bold arc.Leave pi in your answer.

• 5688π ft

• 15.8π ft

• 150.4π ft

• 54,150 ft

Find the arc length.  Leave your answer in terms of π.

• 7/4π

• 7/2π

• 1/8π

• 45π

• 5

• 5/12

• 66

• 1