Area and Circumference Practice

What is the formula to calculate the area of a circle?

• A = 2πr

• A = 3r^2

• A = πr^2

• A = 0.5πr^2

Tags

CCSS.7.G.B.4

Find the area of a circle with a radius of 8 cm. (Use π=3.14)

• 200.96 square cm

• 150.72 square cm

• 100.48 square cm

• 64.32 square cm

Tags

CCSS.7.G.B.4

What is the formula to find the circumference of a circle?

• r^2

• 2 * r

• 2 * π * r

• π * r

Tags

CCSS.7.G.B.4

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

• 8 cm

• 4 cm

• 6 cm

• 10 cm

Tags

CCSS.7.G.B.4

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

• The relationship between the radius and diameter of a circle is that the diameter is always twice the length of the radius.

• The diameter is always half the length of the radius

• The radius and diameter of a circle are always equal

• The radius and diameter of a circle have no relationship

Tags

CCSS.7.G.B.4

If the circumference of a circle is 31.4 cm, what is its radius? (Use π=3.14)

• 7 cm

• 3 cm

• 10 cm

• 5 cm

Tags

CCSS.7.G.B.4