An artist wants to frame a square painting with an area of 400 square inches. she wants to know the length of the wood trim that is needed to go around the painting

Area of square painting is 400 square inches.

Let the side of square painting is = a inch

So the area of square painting is = square inch.

So



Length of wood trim to need to go around the painting is equal to the perimeter of square painting .

So the perimeter of square painting is = 4 * (side)
                                                                  = 4* 20 = 80 inch.

So the required length of wood trim is = 80 inch.

The answer is the third choice