A rectangular prism can be unfolded into the net shown below. Find the total surface area of the reclangular prism. 4 yd 10 yd 7 yd//I dont know if this makes sence but still​

Use pythagorean’s theorem and find the missing side lengths of the two smaller triangles and add them together
13^2 - 12^2 = 5
15^2 - 12^2 = 9
5+9 = 14
14 is the length of each side of the square
14^2 + 14^2 = 19.8
19.8 is the diagonal length of the inside if the square