Question

The radius of a circle is 1 kilometer. What is the circle's circumference?
r=1 km
Use ​ ≈ 3.14 and round your answer to the nearest hundredth.

Answer 1

Area of a circle is given by A=πr²

Plugging π=3.14 and r=1 km

We get A=3.14 km²

or

A=3,140,000 m²