Heron's Formula class 9 NCRT Ex. 12.1 Q.3
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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” (see Attachment ). If the sides of the wall are 15 m, 11 m and 6 m, find the area painted in colour
- 1st Side ⇒ 15 m
- 2nd Side ⇒ 11 m
- 3rd Side ⇒ 6 m
- Area
Note → s here refers to semi perimeter
Now,
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Question :-
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 15 m, 11 m and 6 m, find the area painted in colour.
Answer with explanation :-
Given :-
- If the sides of the wall are 15 m, 11 m and 6 m
To Find :-
- The area painted in colour
Solution :-
Let,
- 1st side(a) = 15 m
- 2nd side(b) = 11 m
- 3rd side(c) = 6 m
We know that,
Where,
- s = Semi-perimeter
- a = 1st side
- b = 2nd side
- c = 3rd side
Substitute the values we get,
We know that,
Where,
- s = Semi-perimeter
- a = 1st side
- b = 2nd side
- c = 3rd side
Substitute the values we get,
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