Circles (7.9B, 7.9C, 7.5B)

Which formula represents the circumference of a circle?

• Both A and B

If the radius of a circle is 5 cm, what is its diameter?

• 8 cm

• 10 cm

• 3 cm

• 15 cm

What is the relationship between the radius and diameter of a circle?

• The radius of a circle is equal to its diameter.

• The diameter of a circle is half the length of its radius.

• The diameter of a circle is twice the length of its radius.

• The radius of a circle is always greater than its diameter.

The area of a circle can be found using which formula?

If the diameter of a circle is 12 cm, what is its radius?

• 4 cm

• 8 cm

• 6 cm

• 10 cm

What is the value of pi (π)?

• 4.6692

• 3.33333

• 3.14159

• 2.71828

What is the total percent shown in a full circle like the one shown?

• 40%

• 100%

• 270%

• 180%

What is the radius?

Find the Circumference (round to nearest tenth):
radius = 6 cm

• 37.7 cm
• 37.8 cm
• 37 cm
• 18.8 cm

What is the area of a circle with a radius of 7 cm?

• 153.86 cm²

• 43.96 cm²

• 154.84 cm²

• 46.48 cm²