Mensuration is a branch of mathematics which mainly deals with the study of different kinds of Geometrical shapes along with its area, length, volume and perimeters.

**Area**

The surface covered by the border line of the figure is the area of the plain shape.

Unit of the area is square of the length unit.

**Perimeter**

The perimeter is the length of the boundary of the plane shape.

The unit of the perimeter is same as the length unit.

Shape | Image | Area | Perimeter |

Square | (Side)^{2} | 4 × Side | |

Rectangle | Length × Breadth | 2(Length + Breadth) | |

Triangle | (1/2) × Base × Height where, a, b and c are the three sides of the triangle) | a + b + c | |

Parallelogram | Base × Height | 2(sum of adjacent sides) | |

Circle | Where, r = radius of the circle |

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