1.

Area of a right triangle is 54 . If one of its legs is 12 cm long, its perimeter is:​

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Answer:

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Step-by-step explanation:

Area of right triangle=1/2×b×h

= 54 =1/2×12×h

= h = 9 CM

we know that in a RT triangle

{h}^{2} = {side}^{2} + {side}^{2}

=

{h}^{2} = {12cm}^{2} + {9cm}^{2}

= 144 {cm}^{2} + 81 {cm}^{2}

= 225 {cm}^{2}

THEREFORE h =15cm

Now perimeter=15cm+9cm+12cm

= 36 cm


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