Question

The radius and slant height of a conical tank are in the ratio 3:5. If its volume is 12936 kl then in the cos of cementing it from inside @1paise/cm2.​

Answer 1

Radius (r) and height (h) of cone are in ratio 3:4

r/h= 3/4

r=(3/4)h

Volume of cone, V=(1/3) πr²h= (1/3)π [(3/4)h] ²h = (π/3) (9/16)h³

12936 = (3π/16)h³

h= 28

r = (3/4) 28 = 21

Slant length (s) = √(28²+21²) = 35

Second thought:

When r=3, h=4, s=5 and therefore volume = 37.69

When r=21, h=28, then volume = 12936

Ratio = 12936 /37.69 = 343

Therefore, s = 5 (∛343) = 35

Ans: 35 cm

Answer 2

Answer:

ans =35

Step-by-step explanation:

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