Question

Which circles have an area less than 300 square centimeters?

Answer 1

Let's write a formula for circle area:

A = $\pi*R^2$

To answer this question we just need to find the radius:

R = $\sqrt{\dfrac{A}{\pi}}=\sqrt{\dfrac{300}{3.14}}\approx9.77cm$

So, all circles that have radius between 0 and 9.77cm will have area less than 300cm²

Or you can write it like: 0 < R < 9.77