Question

1. 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.

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Answer 1

Answer:

area painted in color =22.8msq

Answer 2

Given :-

• The sides of the walls are 15m, 11m and 6m.

To Find :-

• Find the area painted in color ?

Solution :-

we know that, area of a ∆ with sides as a, b and c is ,

• Area = √[s*(s - a)(s - b)(s - c)] where s is semi - perimeter.
• s = (a + b + c)/2 .

so,

→ s = (15 + 11 + 6)/2

→ s = 32/2 = 16 cm.

then,

→ Area of ∆ = √[16 * (16 - 15) * (16 - 11) * (16 - 6)]

→ Area = √[16 * 1 * 5 * 10]

→ Area = √(4² * 5² * 2)

→ Area = 4 * 5√2

→ Area = 20√2 m². (Ans.)

Learn more :-

In ABC, AD is angle bisector,

angle BAC = 111 and AB+BD=AC find the value of angle ACB=?

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