The area of triangle with given two sides and respectively and perimeter equal to is:
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Step-by-step explanation: SUPPOSE
perimeter= sum of all side
18+10+x=42
x=14
then use herons formula
we have to find the semi perimeter(s)
s=sum of all side/2
s=42/2=21
formula=✓s(s-a)(s-b)(s-c)
by putting the value your answer come
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