Question

The height of a cone is 16 cm and base radius is 12 cm and its slant height is​

Answer 1

$\Large{\underline{\underline{\bf{Solution}}}}$

➛ 20 cm

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$\huge\bold{Explanation :-}$

Given :-

• The height of a cone is 16 cm.

• The base radius of cone is 12 cm.

To Find :-

• The slant height of a cone.

Solution :-

We know that,

l² = h² + r²

➛ I = √ h² + r²

We have,

• r = 12 cm

• h = 16 cm

Finding the slant height,

I = √ h² + r²

➛ I = √ 16² + 12²

➛ I = √ 256 + 144

➛ I = √400

➛ I = √ 20 × 20

➛ I = 20 cm

Hence, The slant height of a cone is 20 cm.

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Hope it's helpful :)

Answer 2

Step-by-step explanation:

Answer

R.E.F image

OA=16cm,AB=l

l=

16

2

+12

2

=

256+144

l=20cm

curved surface Area,

C.S.A=πrl=3.14×12×20=753.6cm

2

Total surface Area,

T.S.A=πr(r+l)=3.14×12[12+20]=1205.76cm

2