Circles

what is the formula for finding circumference

select ALL that apply

• c = π d

• c = 2 π r

• d = 2 r

• r = d/2

Which answer best describes a radius?

CHOOSE 2.

• radius is five times larger than a diameter

• radius = half of the diameter

• a radius is 1/4 the size of the diameter

• diameter is the radius x 2

What is the formulas for circumference of a circle? (Select Two.)

• C = pi x r

• C = pi x 2r

• C = pi x D

• C = pi x 2D

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

• Radius
• Diameter

Find the radius of the circle

• 20 ft

• 10 ft

• 5.5 ft

• 10

Wrapping ribbon around a vase.

• Area
• Circumference

What is the diameter?

• 8
• 16
• 10
• 4

Which equation would you use to find the area of a circle?

• πr²

• dπ

• 2r

• ½d

What is the area of this circle?

• 62.59
• 113.1
• 19.81
• 28.27

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

• Radius
• Diameter