Question

On a rectangular wall of length 26 metres and height 21 metres, there is a window in the shape of triangle surmounted on a square. If the base of triangle and square overlap and length of each side of the square is 9 metres and length of altitude of the triangle is 6 metres, then excluding the window, what is the surface area of the wall?

A 438 sq.m
B 416 sq.m
C 408 sq.m
D 424 sq.m
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