calculate the area of shaded region .
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AB=√(12^2+5^2)=13
Area of the unshaded region =(1/2)×12×5=30
find the area of the triangle ABC whose sides are 13,14 and 15 using the formula
A=√{s(s-a)(s-b)(s-c)}.
s=(a+b+c)/2 =13+14+15=42/2=21
A=√{21×8×7×6}=7×3×4=84
Area of shaded region=84-30=54
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