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Floor and ceiling are rectangles of  length X breadth

Walls on the left and right side are :  length * height  each
Walls on the front (with door) and far in the front of door:  breadth * height each

door area = its width * height  ,  this is to be subtracted from the front wall area.

we consider only the inside the hall  and not outside wall surface.

Area to paint = 2 * 5 * 7 + 2 * 6 * 7 - 1 * 0.5  = 153.5 square meters

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