book Maths Puzzle Numerical Ability

two circles each of radius 5cms intersect each other. if the distance between their centres is 5 root 2 cms, find the area of the portion common to the two circles.

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(8+7)(4)=n(4) what is the property used? 1. A designer, attempting to arrange the characters of his artwork in the form of a square grid with equal number of rows and columns, found that 24 characters were left out.