Exploring the Area of Circles

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

• Area = Pi * radius^2

• Area = Pi * diameter

• Area = radius * diameter

• Area = 2 * Pi * radius

If the diameter of a circle is 16 ft, what is the radius?

• 8 ft

• 16 ft

• 4 ft

• 32 ft

Using Pi as 3.14, calculate the area of a circle with a radius of 8 ft.

• 200.96 sq ft

• 100.48 sq ft

• 150.72 sq ft

• 250.88 sq ft

What is the radius of a circle if its diameter is 30 inches?

• 60 inches

• 7.5 inches

• 15 inches

• 30 inches

How do you find the radius of a circle from its diameter?

• Divide the diameter by 2

• Multiply the diameter by 2

• Multiply the diameter by Pi

• Divide the diameter by Pi

Calculate the area of a circle using a radius of 15 inches and Pi as 3.14.

• 176.625 sq in

• 1413 sq in

• 706.5 sq in

• 353.25 sq in

What is the area of a rectangle with a base of 13 cm and height of 6 cm?

• 78 sq cm

• 76 sq cm

• 80 sq cm

• 82 sq cm

If a composite figure consists of a rectangle and two semicircles, how do you calculate the total area?

• Add the area of the rectangle and the area of a full circle

• Multiply the area of the rectangle by two

• Add the area of the rectangle and half the area of a circle

• Subtract the area of the semicircles from the rectangle

What is the area of a circle with a radius of 3 cm using Pi as 3.14?

• 28.26 sq cm

• 14.13 sq cm

• 42.39 sq cm

• 56.52 sq cm

What is the total area of the composite figure described?

• 102.26 sq cm

• 110.26 sq cm

• 100.26 sq cm

• 106.26 sq cm