Circle Area and Perimeter

What is the formula to calculate the area of a circle?

• A = 0.5πr^2

• A = 3r^2

• A = πr^2

• A = 2πr

If the radius of a circle is 7 cm, what is its area using pi as 22/7?

• 22

• 98

• 44

• 154

What is the formula to calculate the perimeter of a circle?

• 2 * π * r

• 2 * r

• r^2

• π * r

If the diameter of a circle is 14 cm, what is its perimeter using pi as 22/7?

• 44 cm

• 28 cm

• 50 cm

• 38 cm

If the radius of a circle is 10 cm, what is its area using pi as 22/7?

• 314.29 cm^2

• 392.86 cm^2

• 220 cm^2

• 157.14 cm^2

If the diameter of a circle is 21 cm, what is its perimeter using pi as 22/7?

• 66 cm

• 57 cm

• 33 cm

• 42 cm

If the radius of a circle is 5 cm, what is its area using pi as 22/7?

• 10.47 cm^2

• 15.71 cm^2

• 78.57 cm^2

• 39.28 cm^2

If the diameter of a circle is 28 cm, what is its perimeter using pi as 22/7?

• 56 cm

• 70 cm

• 88 cm

• 100 cm

If the radius of a circle is 12 cm, what is its area using pi as 22/7?

• 264.38 cm^2

• 572.04 cm^2

• 452.57 cm^2

• 150.72 cm^2

If the diameter of a circle is 35 cm, what is its perimeter using pi as 22/7?

• 154 cm

• 110 cm

• 88 cm

• 70 cm