Circle Geometry Quiz

What is the formula used to find the radius of a circle when given its circumference?

• C = R/2π

• C = πD

• C = 2πR

• C = πR²

If the circumference of a circle is 62.8 miles, what is the radius rounded to the nearest tenth?

• 10.0 miles

• 10.1 miles

• 9.9 miles

• 9.8 miles

How do you find the diameter of a circle if you know the area?

• Divide the area by π and then take the square root

• Multiply the area by 2π

• Divide the area by 2 and then take the square root

• Multiply the area by π and then take the square root

What is the diameter of a circle if its area is 201.1 square inches?

• 20 inches

• 18 inches

• 16 inches

• 14 inches

When given the area of a circle, what is the first step to find its circumference?

• Find the diameter

• Find the radius

• Multiply the area by π

• Divide the area by 2

If the area of a circle is 64π square miles, what is its circumference?

• 16π miles

• 8π miles

• 64π miles

• 32π miles

How do you find the area of a circle if you know its circumference?

• Use the formula A = C²/4π

• Use the formula A = 2πR

• Use the formula A = C/2π

• Use the formula A = πR²

What is the area of a circle if its circumference is 6π yards?

• 9π square yards

• 12π square yards

• 6π square yards

• 18π square yards

What condition must be met for a circle's area and circumference to be equal?

• The radius must be 1

• The radius must be 2

• The diameter must be 2

• The diameter must be 1

If a circle's radius is 2, what are the values of its area and circumference?

• Both are 2π

• Both are 4π

• Area is 4π, Circumference is 2π

• Area is 2π, Circumference is 4π