False, Clarification: Let the sweep of circle = r At the point when a strong ball is by and large fitted inside the cubical box of side a, We get, Width of ball = Edge length of 3D shape \[2r\text{...
Exercise 12.2
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A strong cone of sweep r and tallness h is set over a strong chamber having same base range and stature as that of a cone. The complete surface space of the consolidated strong is πr[√(r2 + h2 +3r + 2h].
False Clarification: At the point when a strong cone is put over a strong chamber of same base range, the foundation of cone and top of the chamber won't be shrouded in absolute surface region....
A solid cylinder of radius r and height h is placed over other cylinder of same height and radius. The total surface area of the shape so formed is 4πrh + 4πr2.
False, Clarification: As indicated by the inquiry, At the point when one chamber is set over another, the foundation of first chamber and top of other chamber won't be canvassed in all out surface...
Two indistinguishable strong sides of the equator of equivalent base range r cm are remained together along their bases. The all out surface space of the blend is 6πr2.
False, Clarification: At the point when two sides of the equator are consolidated along their bases, a circle of same base range is framed. Bended Surface Area of a circle = 4πr2.