Question

The radius of base of the cone is 12cm and slant height is 9m.find the total surface area of the cone

Answer 1

Radius of the cone=12cm

Slant height of cone = 9cm

Total surface area of cone= πr(l+r)

=22/7*12(9+12)

=22/7*12*21

=22*12*3

= 792 cm^2

Answer 2

$\huge\bold{ANSWER~:}$

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☆ Here we have to find TSA of cone

whose l = 9 m and r = 12 cm

☆ First we have to convert 12 cm into

m and 12 cm = 0.12 cm

☆ We know that TSA if cone :-

$= \pi r(l + r) \\ \\ = \frac{22}{7} \times 0.12(9 + 0.12) \\ \\ = 3.43 { \: cm}^{2}$

${\large\color{Red}{Answer~is~{3.43~cm}^{2} }}$

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