Perimeter of a rectangle - 2 × (Length + Width), Area of a rectangle - Length × Width, Perimeter of a square - 4 × Side, Area of a square - Side × Side, Formula for the area of a triangle - ½ × Base × Height, Perimeter of a triangle - Sum of all sides, Finding the area of a circle - π × Radius², Units for measuring area - Square units (e.g., cm², m²), Finding area of an irregular shape: - Divide into regular shapes and sum their areas, Finding area using grid method - Count the squares inside the shape, Perimeter of a parallelogram - 2 × (Base + Side), When to use perimeter - To find the distance around a shape,

13. Mensuration

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