Circumference and Area of Circles

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

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

Tags

CCSS.HSG.GMD.A.1

If my radius is 10 ft, what is my diameter?

• 20 ft

• 5 ft

• 31.4 ft

• 62.8 ft

What is the circumference of this circle? Use $\pi=3.14.$    $\left(C=\pi d\right)$  

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm

Find the circumference of a circle with a radius of 12.5 mm. Use  $\pi=3.14.$    $\left(C=2\pi r\right)$  

• 37.68 mm

• 18.84 mm

• 78.5 mm

• none of the above

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.

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's area? Use  $\pi=3.14.$    $\left(C=\pi r^2\right)$  

• 31.25 m²

• 29.55 m²

• 30.36 m²

• 28.26 m²

What is the area of this circle? Use  $\pi=3.14.$   $\left(C=\pi r^2\right)$  

• 18.84 cm²

• 37.68 cm²

• 75.36 cm²

• 113.04 cm²

What is the area of this circle? Use  $\pi=3.14.$    $\left(C=\pi r^2\right)$  

• 1,384.74  $ft^2$  

• 2,142.12 $ft^2$  

• 5,541.77  $ft^2$  

• 1,289.12  $ft^2$  

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

• Radius
• Diameter

Tags

CCSS.HSG.C.A.2

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2.

• Divide the diameter by 2.

• Add 2 to the diameter.

• Subtract 2 from the diameter.