Question

find the area of a equilateral trinangle whose perimeter is 60 cm

Answer 1

Answer:

Perimeter=3a and a is side of triangle

Then a=20

Area=√3/4a^2

So √3/4(20)^2

Answer is 100√3

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Step-by-step explanation:

Answer 2

Answer:

given perimeter = 60cm

since,its an equilateral triangle all sides are equal.

so

x+x+x = 60cm

3x = 60

x = 20cm

so each side = 20cm

area of equilateral triangle = √3 a²

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4

so, here a is the side of the triangle

=> √3 (20)²

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4

=> 400√3

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4

=> 100√3 is the area