Area and Circumference of Circles

what is the circumference of this circle ?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm

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

• 37.68mm

• 18.84mm

• 78.5mm

• none of the above

What is π ? (Best Choice)

• The ratio of the circumference of any circle to its diameter.

• Exactly 3.14

• Exactly 3.1415

• Exactly 3.141593

Jayne has a very large circular lollipop that has a circumference of 25.12 inches. What would the diameter of Jayne’s lollipop be? Use π = 3.14.

• 4 in.

• 8 in.

• 12 in.

• 16 in.

• area

• circumference

• square root

Mark has a circlular fire pit with a diameter of 5 feet. Build a brick border around the pit. Find the area of pit. Complete the statements about Mark's circular pit. To build the border, Mark needs a minimum of feet​ (a)   The area of the pit, to the nearest square foot is ​ (b)  

• 16

• 20 sq ft

• 7

• 8

• 9

• 15

• 8 sq ft

• 79 sq ft

• 314 sq ft

Match the following definitions to the terms:

• square units (units²)

• Area of a circle

• feet, cm, inches

• Units of circumference

• The distance around a circle

• Circumference of a circle

• How much space a circle takes up

• Units of area

Mark has a circlular fire pit with a diameter of 5 feet. * Build a brick border around the pit. * Find the area of pit. Complete the statements about Mark's circular pit. To build the border, Mark needs a minimum of feet​ (a)   The area of the pit, to the nearest square foot is ​ (b)  

• 16

• 20 sq ft

• 7

• 8

• 9

• 15

• 8 sq ft

• 79 sq ft

• 314 sq ft

Match the formulas to the measurements indicated.

• 2r

• To find the diameter of a circle use:

• To find the radius of the circle use:

• To find the circumference of a circle use:

• d/2

• To find the area of a circle use:

Match the following

• Sector Area

• circumference of a circle

• Arc Length

• Area of a Circle