I'm guessing you are talking about the surface area of a cone? <span>Also by length of the edge, do you mean slant height? Here is the area formula for a cone: Lateral Area = (<span>π<span> • r •<span> slant height) Solving for "r" we get: </span></span></span></span> radius = Lateral Area / (<span>π<span> • </span></span><span><span>slant height)</span><span><span /></span></span>
When you calculate the radius, you can solve for the height by height^2 = slant height^2 - radius^2
