The "slant height" is called the lateral height.There is no formula. However, if you find the radius of the base and the height of the cone, you can form a triangle. Now use the Pythagorean theorem. Radius2 + height2 = lateral height2.
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slant edge is a height of a cone
The volume of this cone is 37,699 cm3
The lateral area... Apex :)
A cone with a diameter of 18km and a slant height of 20.1km has a total surface area of about 822.78km2
A cone with a slant height of 22cm and radius of 7cm has a total surface area of about 637.74cm2