Lateral Area of Right Circular Cone

Theorem

Let $K$ be a right circular cone.

Let $r$ be the radius of the base of $K$.

Let $s$ be the slant height of $K$.

Then the area $\AA$ of the lateral surface of $K$ is given by:

$\AA = \pi r s$

Proof

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Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): cone
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): cone