Plz assert this question with working out

55%

Step-by-step explanation:

Since the perimeter of the square is 40, its side length is 40/4 = 10, so its area is 100.

To find the percentage of the shaded area, I am going to find the unshaded areas, which consist of 2 triangles.

The one on the left has lengths of 10(side length of the square) and 3(10-7), which means it has an area of 10*3/2 = 15.

The one on the right has lengths of 10(side length of the square) and 6(10-4), which means it has an area of 10*6/2 = 30.

That means the unshaded area is 15+30 = 45.

To find the shaded area, just subtract 45(unshaded area) from 100(area of square), which is 55 cm^2.

55 cm^2 is exactly 55% of 100, so the answer is 55%.

I hope this helped you.

correct answer:

a + bi