Thread: Easy Easy Trig help

A cone is 15cm high and has a semi-vertical angle of 18 degrees.

I'm quite good at trigonometry but I just don't get this question can someone help me?

Thanks in advance

the semi vertical angle of a cone is the angle
between the axis and a line in the surface which passes through the apex.

Ok I think I get it. So I have to find the radius

so if I make a right angled triangle...







is this right?

Originally Posted by jgv115

Ok I think I get it. So I have to find the radius

so if I make a right angled triangle...







is this right?

seems so...
don't forget units especially on a test