The length of regular triangle is 5cm. A square has the same perimeter as of triangle, then find the side length of square.

Perimeter of triangle = 3×side

Perimeter of square = 4× side

Side of triangle = 5cm

Perimeter of triangle = 3×5

=15 cm

Perimeter of triangle =Perimeter of square

15cm = 4× side of square

Side of square = 15÷4

=3.75 cm

Therefore ,Side of square is 3.75 cm .

step-by-step explanation:

x = 3 ± √(5+y)