Find the Area of the Circle

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

• πr²

• 2πr

• √π

Jacob is painting a circular picture on his wall.  If the painting has a diameter of 4 ft, how much paint will he need to cover the inside of the circle?  Is this question asking you to find the area, circumference, or neither?

• area

• circumference

• neither

A clock face has a diameter of 10 inches. What is the approximate area of the clock face in square inches?

• 314 in²

• 31.4 in²

• 7.85 in²

• 78.5 in²

What is the area of this circle?

• 6082.12

• 1520.53

• 1893.14

• 1292.92

What is the area of this circle?

• 50.27

• 78.23

• 98.12

• 201.06

Find the area of the circle, round to nearest tenth:
r = 12 in

• 452.2 in²

• 45.2 in²

• 113.0 in

• 450 in²

Find the area of the circle, round to nearest tenth:
r = 15 cm

• 70.65 cm²

• 706.5 cm²

• 176.6 cm²

• 705 cm²

Find the area of the circle, round to nearest tenth:
r = 5 m

• 7.85 m²

• 19.6 m²

• 78.5 m²

• 77 m²

Find the area of the circle, round to nearest tenth:
r = 2.6 ft

• 2.12 ft²

• 22 ft²

• 5.3 ft²

• 21.2 ft²

Find the area of the circle, round to nearest tenth:
r = 18 yd

• 1017.4 yd²

• 10.174 yd²

• 1020 yd²

• 254.3 yd²