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.