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L A traflic signal board, iru:Ucating rSCHOOOL AHEAD: is an equilateral triangle with side 'a'. Find the area of the signal board, using Heron'sform "'..la. If itsperimeter is 180 cm, what will be the area of the signal board?

L A traflic signal board, iru:Ucating rSCHOOOL AHEAD: is an equilateral triangle with side 'a'. Find the area of the signal board, using Heron'sform "'..la. If itsperimeter is 180 cm, what will be the area of the signal board?

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60787 Points
3 years ago
Triangle is an equilateral triangle of side a. a + a + a 3a s = 2 = 2. Using Heron's formula, we get www .cbsepdf .com 86 MATHEMATIC&-IX Area of the triangle = 43: (3 - a)(3 -a)(3; -a) 3a a a a -x-x -x- .J3 a2 2 2 2 2 4 If perimeter = 180 cm, then side = 1!0 = 60 cm. .. Area of the triangle = .J3 x (60>2 = 900 .J3 cm2 4

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