Question

Hello guys..!!!


Find the area of the chart paper used to make the curved surface of a model of cylindrical kaleidoscope of length 25cm and radius 3.5cm.

Answer 1

hi dear here is the answer

r = 3.5cm and  length means height  :- 25cm

to cover circular kaleidoscope we should find curved surface area of circular kaleidoscope which is =

2pyrh

so substituting values we get

2*22/7*3.5*25

=2*22/7*35/10*25

= 350cmsq.cm

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.............or if r=35........

Height of kaleidoscope = 25 cm

Radius of kaleidoscope = 35 cm

Paper used = curved surved surface area of cylinder

=2×227×35×25=2×227×35×25

=2×22×5×25=2×22×5×25

=550cm2

Answer 2

29-May-2018 · She wanted to use chart paper to make the curved surface ... Example 3 - Chapter 13 Class 9 Surface Areas and ... make a kaleidoscope of length 25 cm with a 3.5 cm radius