Question

the transversal height of a cone is 4 times of the radius of its base if the area of the curved surface be 60 ^square metre what is the length of the diameter? ​

Answer 1

Answer:

R.E.F image

OA=16cm,AB=l

l=$\sqrt{16 { }^{2} } + \sqrt{12 { }^{2} }$

$\sqrt{256 + 144}$

l=20cm

curved surface Area,

C.S.A=πrl=3.14×12×20=753.6cm²

Total surface Area,

T.S.A=πr(r+l)=3.14×12[12+20]=1205.76cm²