Question

2. The radius of a cone is 5 cm and vertical height is 12 cm. Find the area of the curved
surface.​

Answer 1

Answer:

CSA of cone = πrl

given,

r=5cm

vertical height=12cm

but we know that l²=h²+r²

=>l=√``h²+r²

l=√144+25

l=13

=>curved surface area= 22/7×5×12

=>curved surface area =188.57cm²

Answer 2

Answer:

204.28

Step-by-step explanation:

Here,

r=5cm

h=12cm

We know,

l2=r^2+h^2

l^2=r^2+h^2

l^2=(5)^2+(12)2^2

l^2=25+144

$l = \sqrt{169}$

l=13

⇒  Area of curved surface =πrl

                                              =722×5×13

                                              =204.28cm2