Semi Circle and Circle Perimeter

What is the formula for the circumference of a circle?

What is the circumference of a circle when the radius is 6cm?

• 14 inches
  

• 3.5 inches
  

• 3 inches
  

• 7 inches
  

Find the perimeter of the figure.  Use 3.14 for pi.

• 20.56 in.

• 17.3 in.

• 17.8 in.

• 31.88 in.

The distance around an object is called the 

• area

• perimeter

What is the perimeter of this composite shape? (Use 3.14 = π and round to the nearest tenths place)

• 20 cm

• 11 cm

• 24 cm

• 19 cm

What is the perimeter of this three quarter circle? (Use 3.14 = π and round to the nearest tenths place)

• 763.4 m

• 120.8

• 113

• 84.8

What is the distance around the semicircle? (Use 3.14 = π and round to the nearest tenths place)

• 18.5

• 11.3

• 20.3

• 22.6

What is the circumference of this semi circle? Round to the nearest tenth

• 12.6

• 20.6

• 25.1

• 33.1

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