Area and Circumference of Circles

What is the area of a circle with the diameter of 10 cm ?

• 66 cm²

• 78.5 cm²

• 66.5 cm²

• 314 cm²

what is the area of this circle ?

What is the area of this circle?

• 6082.12

• 1520.53

• 1893.14

• 1292.92

What is the radius of this circle?

• 18

• 36

• 9

• 6

What is the circumference of a circle with a diameter of 40 in? 

• 125.6 in

• 35.17 in

• 28.67 in

• 47.17 in

What is the circumference of a circle with a radius of 21 cm?

• 131.9 cm

• 121.9 cm

• 111.9 cm

• 141.9 cm

What is the circumference of a circle with a diameter of 56 m?

• 175.8 m

• 176.8 m

• 165.8 m

• 186.8 m

The circumference of a circle is

• The measurement from an edge of a circle to another edge.

• The measurement around the circle

• The measurement from an edge of a circle to another edge going through the center

• The measurement from the center of the circle to an edge of the circle

Find the circumference of a circle with a radius of 12.5 mm .

• 37.68mm

• 18.84mm

• 78.5mm

• none of the above

find the area of the circle below.

• 100 cm

• 225 cm

• 9 cm

• 28.26 cm