Finding the Radius, Diameter, Circumference, and Area

π is equal to circumference divided by _________________ .

• radius

• diameter

• area

• itself

If we know the circumference of a circle is 54.3 meters, what should we do to find the diameter?

• Multiply C x π

• Divide C / π

If the area of a circle is 201.06 cm², find its diameter and circumference round to the nearest tenth.

Diameter=​ (a)   Circumference=​ (b)  

• 16

• 50.3

• 19.3

• 12.6

• 14.2

• 46.4

• 54.1

Sally has car tire with a circumference of 75.36 ft. What is the radius of the car tire and what is the diameter? (Use 3.14 for pi)

• r=12 ft

• d=26 ft

• r=13 ft

• d=24 ft

If my circumference is 37.68cm, what is my diameter?

• 12 cm

• 118.3152 cm

• 6 cm

• 37.68 cm

What is the Circumference of a plastic lid if the diameter

is 7.8 cm?

• 14.3 cm

• 24.5 cm

• Use this Formula C = πd

If the diameter of a circle is 15.3 meters, what is the circumference?

• 5.76 meters

• 48.07 meters

• Use this Formula C = πd

π is a ratio.

It compares a circle's circumference

to its _________________.

• radius

• diameter

• area

• itself

π is a ratio.

It compares a circle's ____________

to its diameter.

• radius

• diameter

• circumference

• itself

Which formula below would you use to find π?

• C/d = π

• C x d= π