## Probability

Probability  Probability means how likely something is to happen Before doing probability, you should read Permutation and combination Experiment: An activity which results in some well Read More …

## Permutation and Combination

Permutation and Combination Permutation means arrangements and combination means selecting or choosing. Permutation: Permutation used for finding the total number of different ways of arrangements. 1. Total Read More …

## Geometry – Lines and Angles and their Properties

Line: A line is a straight path which has no thickness and extends in both directions infinitely.   Ray: It is a part of a line which has an end point in one direction and extends indefinitely in other direction.   Line segment: Read More …

## Geometry ( Median of a triangle )

Median  of a triangle Median: The line joining the vertex to the midpoint of opposite side is called median of a triangle. There is one Read More …

## Geometry (Length of common tangent between two circles)

1. If two circles of radius and touch each other externally, then the length of the direct common tangent is   Proof : Let the length of the common tangent be l   Draw a line OR parallel to PQ OPQ Read More …

## Trigonometry (Height And Distance)

Line of sight When the human eye see any object, then the straight line between human eye and the object is called the line of sight. Angle of elevation When the human eye see an object above the horizontal level Read More …

## Trigonometry ( Formulae and Relations)

Now there are some important formula which are helpful to solve questions sin ( A + B ) = sin A.cosB + sinB.cosA sin ( A – B ) = sin A.cosB – sinB.cosA cos(A + B ) = cosA.cosB – Read More …

## Trigonometry

Trigonometry Trigonometry is the study of ratios of the sides of a right angle triangle.   How to decide, in a right angle triangle which side is base and which side is perpendicular ? Consider the two triangles In the Read More …

## Geometry – Circles and their properties

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