Question

A circular sheet of radius 18cm is divided into 9
Equal sectors it is then divided folded to a cone find the slant height of the cone and its lateral surface area

Answer 1

(a) central angle of a sector , θ = 360°/number of divisions of circular sheet

= 360°/9 = 40°

(b) slant height of cone which can be made by a sector, l = radius of circular sheet = 18cm

(c) radius of cone = r

we know, θ = l/r

⇒40° × π/180° = 2πR/r

⇒2π/9 = 2π × 18cm/r

⇒r = 2cm

hence, radius of cone is 2cm.

now lateral surface area of cone = πrl

= 22/7 × 2 × 18cm

= 792/7

= 113.14 cm²

Answer 2

Answer:

the slant height will be same as radius

Please mark as brainliest answer

Step-by-step explanation:

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