Question

In the figure, I(AB) = 21 cm, I(BC) = 16 cm and I(DC) = 42 cm, then I(AD) = ?
(1) 64 cm
(2) 65 cm
(3) 79 cm
(4) cannot be determined


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Answer 1

answer :: According to me the answer is d

and

you can do it by Pythagoras theorem