If the pentagon is regular, use the formula: Area = (Perimeter × Apothem) ÷ 2
If the pentagon is regular, use the formula: Area = (5 × side²) ÷ (4 × tan(36°))
Find the perimeter by adding all five side lengths
Find the apothem, which is the distance from the center to the midpoint of a side
Multiply the perimeter by the apothem
Divide the result by 2
If the pentagon is irregular, divide it into triangles or simpler shapes
Find the area of each smaller shape
Add the areas together