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**6.3: Surface Areas of Pyramids and Cones**

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Definition Pyramid A polyhedron that has a polygon for the base and the lateral faces are triangles.

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**Formula Lateral Area of a Pyramid Surface Area of a Pyramid**

LA = p x l (l is the slant height) Surface Area of a Pyramid SA = LA + B (Area of the base)

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**Practice Find the surface area of the pyramid. LA = (1/2)pl**

Find the perimeter of the base. = 32 Find the slant height. LA = (1/2)pl

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Definition Cone Similar to a pyramid, but has a circle for a base.

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**Formula Lateral Area of a Cone Surface Area of a Cone**

LA = r x l (pi times radius times slant height) Surface Area of a Cone SA = LA + B (Area of the Circular Base)

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**Practice Find the surface area of the cone. Find the slant height**

LA = r x l = (3.14)(15)(25) SA = LA + B SA =

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