Maths olympiad Exam Numerical Ability

2+2=4
3+3=9
4+4=16
6+6= ?

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Maths olympiad Other Question

CHOOSE THE CORRECT OPTIONS There are 2 regular hexagonal pieces of cloth. From 1st piece a circular piece touching all the edges is cut. The second piece is divided into 6 equilateral traingles and then circular piece touching all 3 sides are cut from each triangle. If r is the ratio of scrap generated in 1st cloth to that of 2nd cloth..find 100r......use root 3 =1.7 and pie =3.1