Surface Area of Pyramids and Cones Section 12.3

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Surface Area of Pyramids and ConesSection 12.3

• Goal
• to find the surface area of a pyramid and the
  surface area of a cone

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Pyramids Cones
Pyramid a polyhedron where the base is a
polygon and the lateral faces are triangles with
a common vertex.
Cone a solid with a circular base and a vertex
that is not in the same plane as the base.
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Pyramids are classified by the shapes of their
bases
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Surface Area verses Lateral Area of a Pyramid

• The lateral area of a pyramid
• LA P Perimeter of the base
• l slant height

• The surface area of a pyramid
• SA B Area of the base

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Example
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Surface Area verses Lateral Area of a Cone

• The lateral area of a cone
• LA r radius of the base
• l slant height

• The surface area of a cone
• SA

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Example
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Students
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Students
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Students