



 
Hi John, To describe a cone we usually use the height $h$ and the radius of the base $r.$ What you want is to guarantee that when the cone is constructed the measure of the angle CAB is specific number, call it $t$ degrees. The measure of the angle $CAD$ is then $\large \frac{t}{2}$ degrees. What is the relationship between the measure of the angle $CAD$ and the lengths $r$ and $h?$ I hope this helps,  


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