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AnilSinghBora
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Asked: 2021-08-19T08:59:24+05:30 In:

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 Fig. 12.10 ). If the sides of the wall are 15 m, 11 m and 6 m, find the area painted in colour. 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 Fig. 12.10 ). If the sides of the wall are 15 m, 11 m and 6 m, find the area painted in colour. Q.3

Hello sir i want to know the best solution of the question from exercise 12.1 of math of Heron’s Formula chapter of class 9th give me the best and easy for solving this question how i solve it of question no.3 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 Fig. 12.10 ). If the sides of the wall are 15 m, 11 m and 6 m, find the area painted in colour

best math ncert solutionexercise 12.1 ncertheron's formula ncertncert class 9th solution
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    1. Guru

      It is given that the sides of the wall as 15 m, 11 m and 6 m.

      So, the semi perimeter of triangular wall (s) = (15+11+6)/2 m = 16 m

      Using Heron’s formula,

      Area of the message =

      Ncert solutions class 9 chapter 12-5

      = √[16(16-15)(16-11) (16-6)] m2

      = √[16×1×5×10] m2 = √800 m2

      = 20√2 m2

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