Question

A triangles with sides of 3 , 6 and 9 has same perimeter as an equilateral triangle with sides of length ​

Answer 1

Answer:

Let the side of the equilateral triangle be s

And the side of the square be a

We know that,

Perimeter of the triangle=3s

and Perimeter of the square =4a

Given that the triangle and the square have the same perimeter and s=8

⇒3s=4a

⇒3×9.6=4a

a=7.2

Answer 2

Perimeter of a triangle is (3+6+9) 18 cm .

Perimeter of triangle = 3 × s

=> 18 cm = 3s

=> s = 18/3 cm

=> s = 6 cm

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