Area and Circumference of Circles

If the problem ask you to find the distance around a circle, which formula should you use?

• r = d/2

• d = 2r

• C = πd

• A = πr²

Tags

CCSS.7.G.B.4

What is the radius of this circle?

• 18 in

• 36 in

• 9 in

Tags

CCSS.7.G.B.4

The radius is....

• a line that crosses through the center and touches each edge 

• the center point of a circle 

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

• an element in science

Find the circumference of a circle that has a radius of 3ft.

• about 18.84 ft.

• about 10 ft

• about 9 ft

• about 16.26 ft

Tags

CCSS.7.G.B.4

What is the circumference of a circle with a radius of 12.7 m? 

• 79.76 m

• 80.34 m

• 14.56 m

• 80.00 m

Tags

CCSS.7.G.B.4

A car wheel has a diameter of 75 cm. What is the circumference of the wheel?

• 235.5 cm

• 245.5 cm

• 215.5 cm

• 225.5 cm

Tags

CCSS.7.G.B.4

find the area of the circle with radius 3 cm below.

• 100 cm²

• 225 cm²

• 9 cm²

• 28.26 cm²

Tags

CCSS.7.G.B.4

Find the radius of a circle that has a diameter of 60mm.

• 120mm

• 60mm

• 30mm

• 15mm

Tags

CCSS.7.G.B.4

What is the perimeter of the semi-circle?

• 11 yd

• 17.27 yd

• 34.54 yd

• 28.27 yd

Tags

CCSS.7.G.B.4

What is the area of this composite shape? (Use 3.14 = π and round to the nearest tenths place)

• 21

• 19.2

• 40.2

• 42