There is a slide in a park.one of its side walls has been painted in some colour with the message. If the sides of the walls are 15cm,11m and 6m.find the area painted in colour.
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There is a slide on a park. One of its side walls has been painted in some colour with a message "KEEP THE PARK GREEN AND CLEAN" (see figure). If the sides of the wall are 15 m,11 m and 6 m, find the area painted in colour.
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ANSWER
Given:
⇒Sides: a=15m, b=11m and c=6m
⇒P=15+11+6=32m
⇒Semi perimeter=S=
2
32
, S=16m
⇒A=
s(s−a)(s−b)(s−c)
(Heron's formula)
⇒A=
16(16−15)(16−11)(16−6)
⇒A=
16×1×5×10
=
800
=20
2
m
2
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