*Circle Practice

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

• Radius
• Diameter

What is the diameter?

• 8
• 16
• 10
• 4

Tags

CCSS.7.G.B.4

Find the radius of a circle who's diameter is 40 ft.

• 40 ft

• 80 ft

• 20 ft

• 45 ft

Tags

CCSS.7.G.B.4

The circumference of a circle is

• The measurement from an point on the circle to another point on the circle.

• The measurement around the circle.

• The measurement from an point on the circle to another point on the circle, going through the center.

• The amount of square units inside the circle.

What formula(s) can be used to find the circumference of a circle? Check all that apply.

Tags

CCSS.7.G.B.4

What is the circumference of this circle?

Use 3.14 for pi and round to the nearest tenth.

• 3.14 cm 
• 37.7 cm
• 24 cm
• 68.4 cm

Tags

CCSS.7.G.B.4

The radius of the circle is 9 meters.  What is the circle's circumference? Use 3.14 for pi.

• 9 meters
• 28.26 meters
• 56.52 meters
• 18 meters

Tags

CCSS.7.G.B.4

What is the formula for area of a circle?

• A =πd

• A = 2πr

• A = πr²

• A = πd²

Tags

CCSS.7.G.B.4

What is the area of this circle? Use 3.14 for pi.

Tags

CCSS.7.G.B.4

what is the area of this semicircle ?

Use 3.14 for pi.

• 100.48 cm²
• 80 cm²
• 200.96 cm²
• 25.12 cm²

Tags

CCSS.7.G.B.4