The formula to calculate the lateral area of a pyramid is:
\[ LA = 0.5 \times P \times s \]
where \( LA \) is the lateral area of the pyramid (square units), \( P \) is the perimeter of the base (units), and \( s \) is the slant height of the pyramid (units).
A pyramid’s lateral area is the total surface area of the pyramid excluding the base. It is calculated by adding up the areas of all the triangular faces on the sides of the pyramid. The formula to calculate the lateral area of a pyramid is \( \frac{1}{2} \times \text{perimeter of the base} \times \text{slant height} \).
Let's assume we have the following values:
Step 1: Multiply the perimeter by the slant height:
\[ P \times s = 20 \times 10 = 200 \]
Step 2: Divide by 2:
\[ LA = 0.5 \times 200 = 100 \]
Therefore, the Lateral Area of the Pyramid is \( LA = 100 \text{ square units} \).