NCERT Solutions for Class 9 Maths Chapter 13
Important NCERT Questions
Surface Areas and Volumes
NCERT Books for Session 2022-2023
CBSE Board, UP Board and Other state Boards
EXERCISE 13.1
Page No:213
Questions No:6
(i) What is the area of the glass?
(ii) How much of tape is needed for all the 12 edges?
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(i) Length of green house l = 30 cm, breadth b = 25 cm and height h = 25 cm
Total surface area of green house = 2(lb + bh + hl)
= 2(30 × 25 + 25 × 25 + 25 × 30) cm² = 2(750 + 625 + 750) cm²
= 2(2125) cm²
= 4250 cm²
Hence, the area of glass for green house is 4250 cm²
(ii) Length of green house l = 30 cm, breadth b = 25 cm and height h = 25 cm
Length of tape for all 12 edges (4 lenght, 4 Breath and 4 Height) = 4(l + b + h)
= 4(30 + 25 + 25) cm = 4(80) cm
= 320 cm
Hence, for all 12 edges, 320 cm tape is required.