Question

find the CSA of a cone whose radius is 4cm and height is 7cm ?​

Answer 1

Answer:

here is your answer mate.......

Step-by-step explanation:

Given that:

r = 4 cm

h = 7 cm

To find the total surface area of the cone, we need slant height of the cone, instead the perpendicular height.

The slant height l can be found by using Pythagoras theorem.

l2 = h2 + r2

l2 = 49 + 16

l2 = 7 + 4

l = 11

The total surface area of the cone is therefore:

SA = πr(r + l)

SA = 3.14 · 4 · (4+11)

SA = 188.4 cm

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