1. The length of the radius of the circumference of a triangle having sides 9 cm, 12 cm and 15 cm is
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By: anil on 05 May 2019 02.08 am
Length of sides of triangle = 9, 12 and 15 cm Clearly, it is aright angled triangle having $$(15)^2=(9)^2+(12)^2$$, where length of hypotenuse = 15 cm Also, the circumcentre of a right angled triangle lies on its hypotenuse, thus circumradius = $$frac{1}{2} imes$$ (hypotenuse) = $$frac{1}{2} imes15=7.5$$ cm => Ans - (B)
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