The area of sector of a circle whose radius is 12 metro and whose angle at the center is $40^\circ$ is?
26.4 $m^2$
39.6 $m^2$
52.8 $m^2$
79.2 $m^2$
Explanation:
42/360 $\times$ 22/7 $\times$ 12 $\times$ 12 = 52.8 $m^2$
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