Find the surface area of each figure?

Surface area of the cube

6(2.5 x 2.5) = 37.5m²

(* Each area is 2.5 x 2.5, and there are 6 sides to the cube)


Surface area of the rectangle prism

2(11 x 7) + 2(9 x 7) + 2(9 x 11) = 478m²

(* The opposite side of the rectangle area is the same, therefore x2)


Overlapping area

2.5 x 2.5 = 6.25m²


Surface area of the composite figure

37.5 + 478 - 2(6.25) = 503m²

(* The bottom of the cube and the top of the rectangle prism overlapped, so the area is overlapped twice, minus 2 times of that area)


503m²

When i did the math i got 11 cm