Question

. In Fig. 13.12, you see the frame of a lampshade. It is to be
covered with a decorative cloth. The frame has a base
diameter of 20 cm and height of 30 cm. A margin of 2.5 cm
is to be given for folding it over the top and bottom of the
frame. Find how much cloth is required for covering the
lampshade. ​

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer :

Height of the frame of lampshade -

$\\ \sf \: = (2.5 + 30 + 2.5) \: \: cm \\ \\ \\ \sf \: = 35 \: \: cm$

Radius -

$\\ \sf \: \frac{20}{2} \: cm \: = 10 \: \: cm \: \:$

CSA = 2πrh

$\\ \implies \sf \bigg(2 \times \frac{22}{7} \times 10 \times 35 \bigg) \: \: {cm}^{2} \\ \\ \\ \implies \sf \: 2 \times 22 \times 50 \\ \\ \\ \implies \sf \: 2200 \: \: cm {}^{2}$

Therefore, 2200 cm² cloth will required for covering the lampshade.