Question

If radius of a cone is 2.1cm and height is 20cm, then its slant

height is

a. 2.01 b. 22 c. 20.11 d. 24​

Answer 1

Answer:

Slant height would be of 20.1cm

Step-by-step explanation:

Radius of cone = 2.1cm

Height of cone = 20cm

Slant height of a cone = L

(L)^2 = (r)^2 + (h)^2

(L)^2 = (2.1)^2 + (20)^2

(L)^2 = 4.41 + 400

(L)^2 = 404.41

L = 20.1cm

--------------------------------or-------------------------------------

Radius of cone = 2.1cm

Height of cone = 20cm

Slant height of a cone = L

(L)^2 = (r)^2 + (h)^2

(L)^2 = (21/10)^2 + (20)^2

(L)^2 = (441/100) + (400)

(L)^2 = (441/100) + (400/1) [L.C.M. = 100]

(L)^2 = (441/100) + (40000/100)

(L)^2 = (441+40000/100)

(L)^2 = (40441/100)

(L)^2 = 404.41

L = 20.1cm

I hope you got it.

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