How to solve speed acceleration, marginal cost and rate of change type problems

The problems of the acceleration of speed or velocity, marginal cost, rate of change etc are often asked in competitive examinations. If you will notice all these type of problems common factor is incremental change, i.e. a variable is established, so here we not discussing about constant speed or constant cost etc.

All such type of problems are solved using the concept of function. We can explain by an example of acceleration,

We know acceleration is rate of change of speed, while speed is usually used with concept of fixed time and distance, velocity is often used with concept of distance covered over a period time in a specific direction.  » » Continue to read » » »

Similarity and congruency of triangles

Mid-Point-TheoremSimilarity and congruency of triangles are important concepts as lots of questions are asked in competitive exams are based in these topics. Both these topics are governed by tests like SAS test, SSS test, AAS test RHS test in case of congruency of triangles and AAA test, AA test or SAS test in case the triangles are similar. Lets read this topic and latter on we will also solve some problems based on these concepts

So first we will start with understanding what the congruency and similarity of triangle means

Two triangles are said to be congruent when corresponding angles » » Continue to read » » »

Properties of different type of triangle

basic properties of triangleIn this post we will cover the Basic properties of a common triangle and then will cover the topic of different types of triangles including Isosceles Triangle, Right angled triangle and Equilateral triangle.

You can also read some other related post to this topic at

Basic properties of all types of triangles

1. Sum of all the three angles of a triangle is 180o » » Continue to read » » »

Angles at the intersection of lines

Angles lines IntersectionIn this article we will cover the topics of “Types of angles” and “Angle at intersection of lines”.

An angle is formed when two lines meet at a point or cross each other. When 2 lines meet normally 2 angles are formed internal and exterior angle. When 2 lines cross each other normally 4 angles are formed and 2 pairs are vertically opposite each other.


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