Circumference and Area of a Circle

A DVD has a diameter of 15 millimeters. Which equation would help you determine the circumference?

• c = 15π

• c = 2π15

• c = π(15²)

• c = π(7.5²)

The diameter of Carol's old records from the 80s is 12 inches. Which equation would help you determine the area?

• A = 12π
• A = 2π12
• A = π(12²)
• A = π(6²)

Tags

CCSS.7.G.B.4

What is the circumference? (Round to the nearest whole number.)

• 50

• 25

• 64

• 201

Enrique purchases an antique bowl for his mom for Mother's Day. The diameter of the bowl is 18 cm. What is the circumference of the bowl? (Round to the nearest whole number.)

• 28 cm

• 57 cm

• 254 cm

• 1017 cm

Marisa purchases a pot for her father's garden. The diameter of the bottom of the pot is 18 cm. What is the area of the pot's bottom? (Round to the nearest whole number.)

• 28 cm²

• 57 cm²

• 254 cm²

• 1017 cm²

Find the area of the circle below.

• 113.04 cm units²

• 18.84 cm units²

• 9 cm units²

• 28.26 cm units²

Find the area of the circle.

• 21.98 units²
• 153.86 units²
• 43.96 units²
• 615.44 units²

Tags

CCSS.7.G.B.4

a line that goes from one edge of the circle to another and crosses the center point

• center
• diameter
• dime eater
• radius

Tags

CCSS.HSG.C.A.2

a line from the center point to the edge of the circle

• diameter
• radio
• radius
• pi

Tags

CCSS.HSG.C.A.2

CCSS.HSG.CO.A.1

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

• 31.4 cm²

• 78.5 cm²

• 15.7 cm²

• 314 cm²