Question

8.
The lengths of the sides of a triangle are
5 m, 1.2 decametre and 130 dm. Then its
area is
(A) 24 m
(B) 30 m2
(C) 48 m
(D) 40 m2​

Answer 1

let BC=1.2decametre=12m

AC=130dm=130/10m=13m

and AB=5m

Now,it's clear that,

AB2 +BC2=AC2

so,it is right angle triangle.

therefore area=1/2×BC×AB=1/2×12×5=

30m2

Answer 2

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