A hall of 10 m length, 5 m width and 6 m height is to be painted (one side only). Determine the total surface area to be painted. (neglect the area of windows and doors)(floor area is NOT to be painted)

230 m²

We know that,

Area of four walls = 2(l + b) × h

Area of roof = l × b

We have,

Length = 10 m

Width = 5 m

Height = 6 m

Area of four walls = 2 (10 + 5) × 6 = 2 × 15 × 6 = 180 m²

Area of roof = 10 × 5 = 50 m²

= Total surface area to be painted = 180 + 50 = 230 m²