User:
Areas
Area of a circle
 A circle is a plane figure, bounded by a single curve line called its circumference. Every part of which is equally distant from a point within it, called the center.

Area of circles

 $\fs2\;\;\;Area=\pi\;\cdot\;r^2$

Find the area of the circle which diameter is 18

Take $\fs2\;\;\pi=3.14$
Area=