Review of Circles

What is the "formal" definition of pi?

• 22/7
• 3.1415926
• the ratio of a circle's circumference to its diameter
• the surface area of a sphere of diameter 22/7

Which formula below would you use to find π?

• C/d = π
• C x d= π

π is equal to circumference divided by _________________.

• radius
• diameter
• area
• itself

The diameter of a circular pool is 24.8 feet and the circumference is 77.9 feet. What should you do to find π?

• 77.9 / 24.8

• 24.8 / 77.9

π is a ratio.

It compares a circle's ____________

to its diameter.

• radius

• diameter

• circumference

• itself

What is the circumference of this circle ? Type only number.

What is the area of this circle?

• 163.2
• 15.3
• 124.2
• 113.04

What is the area of this circle?

• 1384.74

• 2142.12
• 5541.77
• 1289.12

What is the area of this circle? Use 3.14 for π

Type only number.

Find the circumference (to the nearest whole number)

• 88 in
• 44 in
• 116 square in
• None of the above