Question

ea of chart paper required = curved surface area of the kaleidoscope
Height (length) of kaleidoscope (h) = 25 cm
= 2trh
22
= 2** *3.5 x 25 cm
= 550 cm
0
Fig. 13.10
EXERCISE 13.2
Assume i
22
7
unless stated otherwise.
The curved surface area of a right circular cylinder of height 14 cm is 88 cm'. Find
diameter of the base of the cylinder.​

Answer 1

Step-by-step explanation:

given that,

the curved surface area of cylinder = 88 cm

the height of the cylinder = 14 cm

we know that,

curved surface area of cylinder = 2πrh

88 cm = 2×π×r×14. (• substitute the given values in the formula)

88 = 28×π×r

88/28 = π×r

22/7 = 22/7×r (• take π as 22/7)

22/7×7/22 = r

r=1

we know that,

diameter = 2r

d = 2×1

d = 2 cm

therefore, diameter of the base of the cylinder is 2cm