A cone is 9cm high and has vertical angle of 60 then the diameter of it's base is. A) 3√3. B) 6√3. C) 9√3. D)18√3. ?
1 Answer
May 17, 2018
- A right cone has its vertex above the center of its base. We know that when used without qualification, the term "cone" implies "right cone."
- The term "vertical angle", is not clear. Assuming that it refers to the opening angle which is the angle at top of cone.
Let
#tan(60/2)="height"/"radius"=9/r#
#=>r=9/tan30#
#=>r=9sqrt3#
#:."diameter"=2r=18sqrt3\ cm#