EXERCISE 12.1 1. A traffic signal …

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EXERCISE 12.1 1. A traffic signal board indicated SCHOOL AHEAD,is an equilateral triangle with side a. Find the area of the signal board,using heron's formula.If it's perimeter is 180cm what will be an area of the signal board?

Posted by Indushri Kulkarni 1 year, 5 months ago

CBSE > Class 09 > Mathematics

1 answers

Namasvi Chouhan 1 year, 4 months ago

Triangle have 3 sides let's take sides =a Sides = perimeter 3a = 180cm a = 180/3 a = 60 cm a=60 , b=60 , c=60 s=a+b+c/2 s = 180/2 s = 90 cm All are in square root √s(s-a)(s-b)(s-c) √90(90-60)(90-60)(90-60) cm² √90×30×30×30 cm² √30×3×30×30×30 cm² 30×30√3 cm² Answer is 900√3 cm²

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CBSE > Class 09 > Mathematics