Length of greenhouse, say l = 30cm Breadth of greenhouse, say b = 25 cm Height of greenhouse, say h = 25 cm (i) Total surface area of greenhouse = Area of the glass = 2[lb+lh+bh] = [2(30×25+30×25+25×25)] = [2(750+750+625)] = (2×2125) = 4250 Total surface area of the glass is 4250 cm2 (ii) Ncert solutions class 9 chapter 13-2 From figure, tape is required along sides AB, BC, CD, DA, EF, FG, GH, HE AH, BE, DG, and CF. Total length of tape = 4(l+b+h) = [4(30+25+25)] (after substituting the values) = 320 Therefore, 320 cm tape is required for all the 12 edges.