Question

The radius and height of a cone are 21cm and 20 cm respectively. Find the total surface area of the cone.​

Answer 1

Answer:

Step-by-step explanation

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Answer 2

Answer:

Given-

r = 21cm

h = 20cm

Formula -

T.S.A of a cone = πr(r+l)

l^2 = r^2 + h^2

Solution -

l^2 = 21^2 =+ 20^2

l^2 = 441 + 400

l^2 = 841

l = 29cm

now, t.s.a,

22/7*21(21+29)

22*3(50)

66*50

= 3300 cm^2

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