Question

4:5, then the ratio of their heights, is
(d) 25 : 64
(a) 1:5
(c) 5:16
(b) 5:4
7. The curved surface area of one cone is twice that of the other while the slant height
of the latter is twice that of the former. The ratio of their radii is
(a) 2:1
(b) 4:1
(c) 8:1
(d) 1:1​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

(d) 25:64

(a) 4:1

CSA of 1st cone = CSA of 2nd cone 

⇒πr1l1=πr2l2

∴l2=2l1

⇒πr1l1=2×πr2×2l1

⇒r2r1=πrl14πrl1=14⇒r1:r2=4:1