Area and Circumference of Circles

How do you find the area of a circle?

Tags

CCSS.7.G.B.4

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

• 66 cm²

• 78.5 cm²

• 66.5 cm²

• 314 cm²

Tags

CCSS.7.G.B.4

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's area?

• 31.25 m²

• 29.55 m²

• 30.36 m²

• 28.26 m²

Tags

CCSS.7.G.B.4

Is the red line a radius or diameter of the circle?

• Radius

• Diameter

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2

• Divide the diameter by 2

• Add 2 to the diameter

• Subtract 2 from the diameter

Tags

CCSS.7.G.B.4

What is the radius of this circle?

• 18

• 36

• 9

• 6

Tags

CCSS.7.G.B.4

What is the circumference of a circle with a diameter of 40 in? 

• 125.6 in

• 35.17 in

• 28.67 in

• 47.17 in

Tags

CCSS.7.G.B.4

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

• 131.9 cm

• 121.9 cm

• 111.9 cm

• 141.9 cm

Tags

CCSS.7.G.B.4

What is the circumference of a circle with a diameter of 56 m?

• 175.8 m

• 176.8 m

• 165.8 m

• 186.8 m

Tags

CCSS.7.G.B.4

Find the circumference of a circle with a radius of 12.5 mm .

• 37.68mm

• 18.84mm

• 78.5mm

• none of the above

Tags

CCSS.7.G.B.4