Question

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Answer 1

Answer:

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Answer 2

Answer:

let the. 3rd side of the triangle is x

perimeter of the triangle = 42

18+10+x=42

28+x=42

x=42-28

x= 14

The semiperimeter of the triangle=42/2=21

Now by heron's formula

=√21(21-18)(21-19)(21-14)

=√21×3×2×7

=21√2

So the area of triangle is 21√2

Hope it helps you....✌️