Dear Aman Singh
If the side is given
then check if square of any side is equal to the sum of square of other two side .c2=a2+b2
then triangle is right angel triangle
area can be calculate by 1/2 a* b
if all the side are equal then area =√3/4 *a2
other wise you can use the formula
area=√s(s-a)(s-b)(s-c)
where a,b,c are side of triangel and s=(a+b+c)/2
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