Circumference of Circles

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

• Radius
• Diameter

If my diameter is 19 inches, what is my radius?

• 38 inches
• 9.5 inches
• 59.66 inches
• 119.32 inches

Tags

CCSS.7.G.B.4

The radius of a circle is

• The measurement from the center of a circle to an edge of the circle.
• The measurement around the circle
• The measurement from and edge of the circle to another edge through the center
• A line perpendicular to the diameter of the circle

• Diameter is: DE
• Diameter is: BA
• Diameter is: BC
• Diameter is: DC

What is the circumference of this circle ?

• 3.14 cm 
• 37.68 cm
• 24 cm
• 68.4 cm

Tags

CCSS.7.G.B.4

What is the formula for circumference of a circle given the diameter?

• C = pi x r
• C = pi x 2r
• C = pi x D
• C = pi x 2D

Tags

CCSS.7.G.B.4

Steven purchases a bowl. The diameter of the
bowl is 14 cm. What is the circumference of the 
bowl?

• 28 cm
• 43.96 cm
• 87.96 cm
• 7 cm

Tags

CCSS.7.G.B.4

A Circle has a radius of 4.  What is the circumference of the circle? (Best Choice)

• 4π or about 12.56
• 16π or about 50.24
• 2π or about 6.28
• 8π or about 25.12

Tags

CCSS.7.G.B.4

Find the perimeter of this figure

• 15.7in

• 55.7in

• 30.7in

• 40.7in

Tags

CCSS.3.MD.D.8

Find the perimeter

• 3 inches

• 8.28 inches

• 3.57 inches

• 5 inches

Tags

CCSS.3.MD.D.8