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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 12

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