Area and Circumference

What is/are the formula(s) to find the area of a circle?

• πr²
• 2πr
• √π

Find the area of the circle below.

• 100 cm

• 225 cm

• 9 cm

• 28.27 cm

What is the area of a circle with a radius of 21 cm?

• 1385.44 cm²

• 2142.12 cm²

• 4348.08 cm²

• 1289.12 cm²

Shring's dining room table is round and has a radius of 4.5 feet. What is the tabletop's area?

• 63.625 ft²

• 68.345 ft²

• 64.585 ft²

• 61.345 ft²

The Girl Scout patch shown has a radius of 1.25 inches.  Approximately, what is the area of the patch?

• 5 sq. in
• 6 sq. in
• 7 sq. in.
• 8 sq. in.

Find the area of the circle

• 43.96
• 153.86
• 87.82
• 307.72

What is the area of this circle?

• 6082.12
• 1520.53
• 1893.14
• 1292.92

If my radius is 10ft, what is my diameter?

• 20ft
• 5ft
• 31.4ft
• 62.8ft

If my diameter is 19 inches, what is my radius?

• 38 inches
• 9.5 inches
• 59.66 inches
• 119.32 inches

What is the diameter?

• 8
• 16
• 10
• 4