Calculating Area and Circumference of a Circle

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

• 2 * Pi * radius

• Pi * radius

• 2 * Pi * diameter

• Pi * radius squared

If the diameter of a circle is 20 cm, what is the radius?

• 5 cm

• 40 cm

• 20 cm

• 10 cm

Which formula can be used to find the circumference of a circle?

• 2 * Pi * radius

• Pi * diameter

• Pi * radius squared

• Both A and C

What is the radius if the diameter is given as 22 cm?

• 11 cm

• 5.5 cm

• 44 cm

• 22 cm

How do you calculate the area of a circle when the radius is 11 cm?

• 11 * Pi squared

• Pi * 121

• Pi * 11

• Pi * 11 squared

What is the area of a circle in terms of Pi if the radius squared is 121 cm squared?

• 121 Pi cm squared

• 242 Pi cm squared

• 60.5 Pi cm squared

• 121 cm squared

What is the area of the circle rounded to the nearest tenth if the area is approximately 380.1327 cm squared?

• 380.1 cm squared

• 380.0 cm squared

• 380.2 cm squared

• 381 cm squared

What is the formula to calculate the circumference using the diameter?

• Pi * diameter

• 2 * Pi * radius

• Pi * radius

• 2 * Pi * diameter

What is the circumference of a circle if the diameter is 22 cm?

• 11 Pi cm

• 88 Pi cm

• 44 Pi cm

• 22 Pi cm

What is the rounded value of the circumference if it calculates to approximately 69.1150 cm?

• 69.2 cm

• 69.1 cm

• 69.0 cm

• 70 cm