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Draw a line segment AB of 3 cm and make an angle of 90 on B , now take a point on the perpendicular with height 2cm and mark it as C join AC you will get the triangle of hypotenuse root 13 How 2^2 + 3^2 = hypotenuse ^2 , 4 + 9 = hyp ^2 => root 13 = hypotenuse