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Area of a sector
 A circle sector is a part of a circle bounded by two radii and their intercepted arc.

Area of a sector

 $\fs2\;\;\;Area=\frac{\pi\;\cdot\;r^2\;\cdot\;x}{360}$

Find the shaded area.
 Area = $\frac{\pi\;\cdot\;r^2\;\cdot\;x}{360}$ r=10m x=360º-300º=60º Area = $\frac{\pi\;\cdot\;10^2\;\cdot\;60}{360}$ = $\frac{100\;\cdot\;\pi}{6}$ = $\frac{50\;\cdot\;\pi}{3}$ m2

Find the area of the sector of a circle which angle is 270degrees and its radius is 5

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