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There is a slide in a park .one of its side walls has been painted in some colour with a message "keep the park green and clean " if the sides of the wall are 15m ,11m and 6m ,find the area painted in colour

Posted by Purva Ramani 3 years, 8 months ago

CBSE > Class 09 > Mathematics

1 answers

Neha Kandpal 3 years, 8 months ago

By using heron's formula Side of walls a=15m,b=11m and c=6m Semiperimeter(s) = a+b+c/2 = 15+11+6/2 =16 Area of triangle = whole root s(s-a)(s-b)(s-c) W.r. 16(16-15)(16-11)(16-6) W.r. 16*1*5*10 W.r.(4*4)*1*(5*5)*2 W.r. will cancel by squares of 4,5 Now, 4*5 w.r. 1*2 = 20 w.r. 2. (w.r.=whole root) 20 whole root 2

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