Question

18. The diameters of two cones 1 point
are equal and their slant
heights are in the ratio 5:4. If
the curved surface area of the
smaller cone is 200cm2, then
the curved surface area of the
bigger cone is

200cm2
250cm2
300cm2
350.8cm2

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Answer 1

Answer:

7:4

Step-by-step explanation:

Since the diameters of two cones are equal, their radius will also be the same.

Let the slant height of the two cones be l₁ and l₂ respectively.

Therefore,

l₁ : l₂ = 7 : 4

The curved surface area of the two cones are

πrl₁ and πrl₂

So, the ratio of their curved surface area are

πrl₁/πrl₂

π and r are cancelled.

⇒ l₁/l₂ = 7/4

So, the ratio of the curved surface area of two cones is 7 : 4

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Answer 2

Step-by-step explanation:

the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.

change in direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.

measurement of the focusing characteristics of an eye or eyes.