slant height

noun

, Geometry.

(of a right circular cone) the distance from the vertex to any point on the circumference of the base.

First recorded in 1790–1800

To find the lateral area of a right pyramid: Multiply the perimeter of the base by the slant height and take half the product.

To find the lateral area of a cone: Multiply the circumference of the base by the slant height and take half the product.

The lateral area of a regular pyramid is equal to half the product of its slant height by the perimeter of its base.

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