Question

"Question 3 There is a slide in the park. One of its side walls has been painted in the same colour with a message "KEEP THE PARK GREEN AND CLEAN" (see the given figure). If the sides of the wall are 15m, 11m, and 6m, find the area painted in colour. Class 9 - Math - Heron"s Formula Page 203"

Answer 1

Step-by-step explanation:

Given:

⇒Sides: a=15m, b=11m and c=6m

⇒P=15+11+6=32m

⇒Semi perimeter=S= 32/2

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

$20 \sqrt{3} m ^{2}$

=

So, the area painted in colour =

$20 \sqrt{3m ^{2} }$