**L** - apothem (lowered perpendicular **O c** from the top **WITH** on the edge of the base **AB** )

**P**- base perimeter

**S**_{main}- base area

The formula for the lateral surface area of a regular pyramid (**S _{side}**):

Calculator - calculate, find the lateral surface area of the regular pyramid

The formula for the total surface area of a regular pyramid (**S**):

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