- Length of boundary of a simple closed figure is known as perimeter.
- Area is the measure of region enclosed in a simple closed curve.
- Perimeter of a rectangle = 2 (length + breadth).
- Area of a rectangle = length × breadth.
- Perimeter of a square = 4 × side.
- Area of a square = side × side.
- Area of a triangle = 1 2 × Base × Corresponding Height.
- Area of a parallelogram = Base × Corresponding Height.
- Area of a circle = 2 r , where r is the radius.
- Area of a trapezium = 1 2 × (Sum of parallel sides) × Height.
- Area of a rhombus = 1 2 × Product of diagonals.
- Lateral surface area of a cube = 4 (side)2.
- Total surface area of a cube = 6 (side)2.
- Lateral surface area of a cuboid = 2 × height × (length + breadth).
- Total surface area of a cuboid = 2(lb + bh + hl).
- Lateral (curved) surface area of a cylinder = 2πrh.
- Total surface area of a cylinder = 2πr (r + h), where r is the radius and h is the height.
- Amount of space occupied by a solid is called its volume.
- Volume of a cube = (side)3.
- Volume of a cuboid = length × breadth × height.
- Volume of a cylinder = πr2h.
- 1cm3 = 1ml
- 1L = 1000 cm3.
- 1m3 = 10,00,000 cm3 = 1,000 L.

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