Premium Online Home Tutors
3 Tutor System
Starting just at 265/hour

In figure below, 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.
image


Answer :

image

Given :
Height (h) of the frame of lampshade = (2.5 + 30 + 2.5) cm = 35cm
Radius (r) of the circular end of the frame of lampshade = \(\frac{20}{2}\) m = 10 m

Now, Cloth required for covering the lampshade
= \(2{\pi}rh\)
= \(2 × \frac{22}{7} × 10 × 35\) \({cm}^2\)
= (44 × 10 × 5) \({cm}^2\)
= 2200 \({cm}^2\)

Hence, for covering the lampshade, 2200 \({cm}^2\) cloth will be required.

NCERT solutions of related questions for Surface areas and volumes

NCERT solutions of related chapters class 9 maths

NCERT solutions of related chapters class 9 science