Area and Circumference of Circles

What does "circumference" mean?

• Space a circle takes up
• Distance around a circle
• Line from one side of a circle to another
• Line from center of circle to side

What is the formula for the circumference of a circle?

• 3.14r

• 3.14d

• 3.14r²

• 3.14 x 2r

Tags

CCSS.7.G.B.4

What does the "area" of a circle mean?

• Distance around the circle

• Space inside the circle

• The distance across the center of the circle

• Half the distance across the center of the circle

What is the formula for the area of a circle?

• 3.14d

• 3.14 x 2r

• 3.14r²

• 3.14r

Tags

CCSS.7.G.B.4

The Jones family wants to enclose their circular garden with a fence. To determine how much fencing to buy, what do you need to calculate; circumference or area?

• circumference

• area

The Jones family wants to enclose their circular garden with a fence. To the nearest foot, what is the minimum length of fencing they need to buy?

• 56.25 ft

• 246 ft

• 365 ft

• 393 ft

Tags

CCSS.7.G.B.4

A school’s art teacher designs a circular flower bed inside a rectangular sandbox. The sandbox is 6 feet wide and 10 feet long.

If you're trying to figure out how much sand will fit, what are you finding?

• circumference

• area

A school’s art teacher designs a circular flower bed inside a rectangular sandbox. She wants to put sand in the sandbox OUTSIDE of the flower bed. How many square feet will there be for sand after the flower bed is installed? Use 3.14 for π.

*Find the area of the whole sand box then subtract the area of the circle.

*To figure out the diameter of the flower bed, use the width of the rectangle

• 22 square feet

• 28 square feet

• 32 square feet

• 41 square feet

Tags

CCSS.7.G.B.4

Shawn is placing a fence around a circular garden with a 15-foot diameter. To figure out how much fencing he will need, what should you find?

• circumference

• area

Shawn is placing a fence around a circular garden with a 15-foot diameter. How many feet of fencing will Shawn need to buy to enclose the garden? Use 3.14 for π. Think carefully about your answer.

• 47 feet

• 48 feet

• 177 feet

• 707 feet

• 178 feet

Tags

CCSS.7.G.B.4