Question

Find the area of a triangle two sides of which are 18cm and 10cm and the perimeter is
42cm.
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Answer 1

Answer:

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Answer 2

let third side be x

then 18+10+ x = 42 ( perimeter = a+b+c)

x = 14

hence,third side = 14 cm

now use a =18 cm ,b = 10 cm ,c = 14 cm

Now use heron's formula to find area