Where r radius of the cone at base. If you know the area and the length of a base then you can calculate the height. A 1 2 bh A 1 2 b h In contrast to the Pythagorean Theorem method if you have two of the three parts you can find the height for any triangle.
Next determine the height from center to top.
Use our below online slant height of a cone calculator by entering the height and radius in the respective input boxes and then click calculate button to find the slant height of a cone with steps. Calculate the slant height using the formula above. Make sure you dont confuse the slant height with the height which is the perpendicular distance between the top vertex to the base. To measure it you have to place the yardstick at a slant.