Curved susfaceArea of a cylinder is 1056cm3 If height of the Cylinder is 8cm. then what is the diameter of it's bese?
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Answer:
8th mean = 9 th term in A.P =t
9
=3+8d
(n-2)th mean = (n-1)th term in A.P =t
(n−1)
=3+(n−2)d
It is given that,
t
n−1
t
9
=
5
3
3+(n−2)d
3+8d
=
5
3
9+3nd−6d=15+40d
3nd=46d+6 or nd=
3
46
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