Circumference and Area of Circles Formula

The distance around a circle; much like the perimeter of a rectangle.

• perimeter

• diameter

• circumference

• radius

What is the distance around a circle?

• Circumference

• Area

• Diameter

• Radius

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

A bicycle tire has a diameter of 27 inches. What is the radius?

• 27pi

• 13.5

• 81

• 25pi

What is the perimeter of the semi-circle?

• 11 yd

• 17.27 yd

• 34.54 yd

• 28.27 yd

Find the circumference (to the nearest whole number)

• 88 in

• 44 in

• 116 square in

• None of the above

what is the circumference of this circle ?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm

The Jones family wants to enclose their circular garden with a fence. To the nearest foot, what is the minimum length of fencing they need to buy?

• 56.25 ft

• 246.2 ft

• 365.56 ft

• 392.5 ft

What is the area of this circle?

• 62.59 cm²

• 113.1 cm²

• 19.81 cm²

• 28.26 cm²

Find the area of the circle