A rectangular strip $25 c m \times 7 c m$ is rotated about the longer side. Find the volume of the solid, thus generated.

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Solution

Size of rectangular strip = $25 c m \times 7 c m$
By rotating, about the longer side, we find a right circular cylinder, then the radius of cylinder (r) = 7cm

and height(h) =25cm
$∴$ Volume = $π r^{2} h = \frac{22}{7} \times 7 \times 7 \times 25 c m^{3} = 3850 c m^{3}$

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A rectangular strip 25cm×7cm is rotated about the longer side. Find the volume of the solid, thus generated.

Size of rectangular strip = 25cm×7cm By rotating, about the longer side, we find a right circular cylinder, then the radius of cylinder (r) = 7cm and height(h) =25cm ∴ Volume = πr2h=227×7×7×25cm3=3850cm3

A rectangular strip $25 c m \times 7 c m$ is rotated about the longer side. Find the volume of the solid, thus generated.

Size of rectangular strip = $25 c m \times 7 c m$
By rotating, about the longer side, we find a right circular cylinder, then the radius of cylinder (r) = 7cm

and height(h) =25cm
$∴$ Volume = $π r^{2} h = \frac{22}{7} \times 7 \times 7 \times 25 c m^{3} = 3850 c m^{3}$