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the picture is not full.
but hope it helps you.
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Area of bigger triangle ABC
by heron's formula
semi-perimeter
=(120+112+22)/2=254/2=127m
Area =^127*(127-112)*(127-120)*(127-22)
=^127*l5*7*l05
Find the area.
then find the area of smaller triangle
then subtract both area value .
thus answer will come.
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