## Geometry (Polygons)

Polygons  A closed figure bounded by n straight lines is called a polygon. Regular polygons A polygon whose all sides are equal is called a regular polygon. Formulae related to polygons Sum of all interior angles of a polygon of Read More …

## Geometry ( triangles)

Triangle Triangle:  A closed figure bounded by three straight lines is called a triangle. A triangle has three vertices Read More …

## Simplification (BODMAS ,powers and surds )

BODMAS – ( bracket of division multiplication addition and subtraction) Step 1 –  First of all solve brackets Step 2 –  After that solve powers and surds ( squares , cubes , square root , cube root etc.) Step 3 Read More …

## Number System ( divisibility rule and remainder theorem)

Natural numbers : 1, 2, 3, 4, 5, ……………………… Whole numbers : 0, 1, 2, 3, 4, 5, …………………. Integers : …………….,-3, -2, -1, 0, 1, 2, 3, 4, 5, …………………. Rational numbers : Numbers which can be written in the form , where p Read More …

## Mensuration ( area of circle )

Circle  Circle is the set of all points which are equidistant from the fixed point . The fixed point is called the center of circle and the distance from the centre to the point of circle is called radius Circumference of Read More …

## Mensuration (Area of 2- dimensional geometry)

Triangle Perimeter of triangle :   Area of triangle =  where s =    Area of triangle  =  = Equilateral triangle    Area of equilateral triangle =  Height of equilateral triangle = Isosceles triangle  Height of isosceles triangle =  Area Read More …

## Area of triangle using Sine and Cosine law:

Sine law : If a, b and c are the sides of a triangle opposite to the angles A, B and C then  =    =   Cosine law :  cosA =  cosB =  cosC =    Area of triangle Read More …

## Real Numbers

Real Numbers Euclid’s division lemma : For any two positive integers a and b , there exist unique integers q and r such that a = bq + r,                     Read More …