7. A cylinder is open at one end. The external
diameter is 10 cm and thickness 2 cm if the height
is 8cm (a) capacity of cylinder (b) volume of
metal used.
Answers
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4
Answer:
a) 226 .29 cm³ b) 480 .86 cm³
Step-by-step explanation:
D = 10 cm Thickness = 2cm h = 8 cm
R = 5cm r = R - w
= 5 - 2 = 3 cm
Capacity of cylinder = π r² h
= 22 /7 x 3 x 3 x 8
= 226 . 29 cm³
Volume of metal used = volume of hollow cylinder + area of circle
= π h (R + r ) ( R - r ) + π R²
= 22/7 x 8 x8 x 2 + 22/7 x 5 x 5
= 402 .29 + 78.57
= 480 . 86 cm³
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