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10. Equilateral Triangle Formulas An equilateral triangle is a triangle in which all three sides are equal. All three interior angles of an equilateral triangle are also equal, and each angle is 60°. If the length of each side is represented by a, the important formulas include its area, perimeter, height, inradius and circumradius. What

9. Trapezium Formulas A trapezium is a quadrilateral having one pair of opposite sides parallel. The two parallel sides are called the parallel sides or bases. The perpendicular distance between them is called the height. In this section, we will learn the important formulas for area, perimeter, height, median and special cases. What Is a

8. Rhombus Formulas A rhombus is a quadrilateral in which all four sides are equal. In the rhombus diagram, each side is represented by a, while the two diagonals are represented by d₁ and d₂. The important rhombus formulas given in the formula sheet are related to its diagonals, area, perimeter and diagonal relation. What

7. Quadrilateral Formulas A quadrilateral is a closed plane figure having four sides, four vertices and four angles. The total of the four interior angles of a quadrilateral is 360°. Quadrilateral questions in mensuration commonly involve area, perimeter, diagonals and angles. What Is a Quadrilateral? A B C D d₁ d₂ AB, BC, CD and

6. Parallelogram Formulas A parallelogram is a quadrilateral in which opposite sides are parallel and equal. In the diagram, let the two different side lengths be represented by a and b. The perpendicular height corresponding to base b is represented by h. The important formulas for a parallelogram include area, perimeter and the relationship between

5. Rectangle Formulas A rectangle is a quadrilateral with four sides and four right angles. Its opposite sides are equal and parallel. Let the length of the rectangle be l and its breadth be b. The most important rectangle formulas are its area, perimeter and diagonal. Rectangle path questions are also commonly asked in competitive

4. Square Formulas A square is a quadrilateral with four equal sides and four right angles. Each interior angle of a square is 90°. The side of a square is represented by a, while its diagonal is represented by d. The square is an important topic in mensuration because its formulas are also useful in

17. Equilateral Triangle Formulas An equilateral triangle is a triangle in which all three sides are equal. If each side of the equilateral triangle is represented by a, then: AB = BC = CA = a Each interior angle of an equilateral triangle is 60°. 1. Equilateral Triangle Diagram a a a h 60° 60°

2. Circle Formulas A circle is a closed two-dimensional figure in which every point on the boundary is at the same distance from its centre. That distance is called the radius. Circle-based questions are important in competitive examinations such as SSC CGL, KPSC, Banking, Railway and other government exams. The most important formulas are for

1. Basic Mensuration Formulas Mensuration is the branch of mathematics that deals with the measurement of geometrical figures. In competitive examinations, mensuration questions mainly involve perimeter, area, surface area and volume. Before learning the formulas for circles, triangles, squares, cubes, cuboids, cylinders, cones and other shapes, it is important to understand these basic terms. What