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Firstly simply calculate semi-perimeter which is equal to (a+b+c)/2 where a,b,c are the sides of triangles and then put it into the following formula
 \sqrt{s(s-a)(s-b)(s-c)} and then solve it then you will get the answer
1567.482057 square units
this formula is called herons formula
1 4 1
S = perimeter/2 = 75+70+65 = 105

from heron's formula,

ar. = √(s(s-a)(s-b)(s-c))
    = √(105(30)(35)(40))
    = 4410000
0 0 0
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