Question

. Find the radius of the base of the cylinder if
(i) its volume is 2310 cm
and height is 15 cm.
(ii) its volume is 15400 cm3 and height is 25 cm.
3​

Answer 1

1,VOLUME OF CYLINDER =2310cm^3

HEIGHT OF THE CYLINDER =15cm

RADIUS =???

VOLUME OF CYLINDER=pie×r^2×h

2310=pie×r^2×15

2310=22/7×15×r^2

2310/1=22/7×15× r^2. cross multiply

2310×7÷22×15 ===r^2

by simplyfing,

r^2=7×7

r=7cm.

2,VOLUME OF CYLINDER =15400cm^3

HEIGHT OF THE CYLINDER =25cm

RADIUS =???

VOLUME OF CYLINDER=pie×r^2×h

15400=pie×r^2×25

pie×r^2=15400/25=616

r^2×22/7=616/1. cross multiply

by symplifying,

r^2=392÷2

r^2=196

r=_/196

r=14cm

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Answer 2

I)2310=π^2h

2310=22/7*15*r^2

2310*7/22*15=r

r=7cm ans..

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