Circumference and Area of Circles and Other Composite Figures

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

• 20ft

• 5ft

• 31.4ft

• 62.8ft

Find the perimeter

• 14 m

• 43.96m

• 176 m

• 191.96 m

Look at the composite figure. How could you find the perimeter of the figure?

• Add the four side lengths shown in the diagram.

• Divide the figure into two rectangles. Find the perimeter of each rectangle. Add the two perimeters.

• Find the two missing side lengths and add them to the four side lengths shown in the diagram.

• Multiply the four side lengths shown in the diagram.

What are the two missing side lengths?

• 6 cm and 2 cm

• 4 cm and 7 cm

• 9 cm and 7 cm

• 6 cm and 10 cm

The radius is....

• a line that crosses through the center and touches each edge 

• the center point of a circle 

• a line from the center point to the edge of the circle

• an element in science

A line that goes from one end of the circle to the other and crosses the center point.  

• center

• diameter

• dime eater

• radius

What is the radius of a circle with diameter 24 cm?

• 24 cm

• 48 cm

• 12 cm 

• 72 cm

What is the area of this circle? Round your answer to two decimal places.

• 82.13

• 78.50

• 314.16

• 170.12

Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?

• 11.32 ft

• 12.25 ft

• 10.99 ft

• 8.75 ft

Jayne has a very large circular lollipop that has a circumference of 25.12 inches. What would the diameter of Jayne’s lollipop be? Use π = 3.14.

• 4 in.

• 8 in.

• 12 in.

• 16 in.