Question

3. There is a slide in a park. One of its side walls has been painted in some colour with a
message "KEEPTHE PARK GREEN AND CLEAN" (see Fig. 12.10). If the sides of the
wall are 15 m, Il m and 6 m, find the area painted in colour.
6 m
- 11 m
KEEP THE PARK
GREEN AND CLEAN
15 m​

Answer 1

Answer:

Given:

⇒Sides: a=15m, b=11m and c=6m

⇒P=15+11+6=32m

⇒Semi perimeter=S= 32/2

, S=16m

⇒A= under root s(s−a)(s−b)(s−c)

(Heron's formula)

⇒A= under root 16(16−15)(16−11)(16−6)

⇒A= underrrot 16×1×5×10

= under root800

=20 underrrot2m^2