1. What is the area of a circle with a circumference of 6 π? 2. If the area of a circle is 4 π square meters, how many meters is its diameter? Tonight!

1. What is the area of a circle with a circumference of 6 π? 2. If the area of a circle is 4 π square meters, how many meters is its diameter? Tonight!

The radius of the circle is 6 π / 2 π = 3
Area = 3 × 3 × π = 9 π
2 radius of circle = under root sign (4 π / π) = 2
The diameter of the circle is 2 × 2 = 4