A rectangular sheet of dimensions 25 cm × 7 cm is rotated about its longer side. Find the volume and the whole surface area of the solid thus generated.
kaveeshachandimal:
does it form a cylinder???
if so,,,
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2 \pi r=7
2x22/7xr=7
therefore,
r=49/44
therefore the volume,
\pi r x r x h=volume of a cylinder
22/7 x 49/44 x 49/44 x 25=97.443cubic centimeters.
the total surface area,
both inside and outside,
25 x 7 + 25 x 7=350 square centimeters.
AM I CORRECT???
2x22/7xr=7
therefore,
r=49/44
therefore the volume,
\pi r x r x h=volume of a cylinder
22/7 x 49/44 x 49/44 x 25=97.443cubic centimeters.
the total surface area,
both inside and outside,
25 x 7 + 25 x 7=350 square centimeters.
AM I CORRECT???
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