Day of the Week:
Day of the Week:
January has 31 days. It means that every date in February will be 3 days later than the same date in January(28 is 4 weeks exactly). The below table is calculated in such a way. Remember this table which will help you to calculate. January | 0 |
February | 3 |
March | 3 |
April | 6 |
May | 1 |
June | 4 |
July | 6 |
August | 2 |
September | 5 |
October | 0 |
November | 3 |
December | 5 |
Step1: Ask for the Date. Ex: 23rd June 1986
Step2: Number of the month on the list, June is 4.
Step3: Take the date of the month, that is 23
Step4: Take the last 2 digits of the year, that is 86.
Step5: Find out the number of leap years. Divide the last 2 digits of the year by 4, 86 divide by 4 is 21.
Step6: Now add all the 4 numbers: 4 + 23 + 86 + 21 = 134.
Step7: Divide 134 by 7 = 19 remainder 1.
The reminder tells you the day.
Sunday | 0 |
Monday | 1 |
Tuesday | 2 |
Wednesday | 3 |
Thursday | 4 |
Friday | 5 |
Saturday | 6 |
Set Theory formulas
Set Theory formulas
Set Theory is a branch of mathematics which deals with the study of sets or the collection of similar objects.
Set theory is one of the most fundamental branch of mathematics.
Set Theory Formulas:
Notations used in set theory formulas:
Formulas:
For a group of two sets:
1. If A and B are overlapping set,
2. If A and B are disjoint set,
3.
4.
5.
6.
7.
8.
9.
10.
11.
For a group of three sets:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Centroid of a Triangle
Centroid of a
Triangle
In mathematics and physics, the centroid or geometric center of a two-dimensional region is, informally, the point at which a cardboard cut-out of the region could be perfectly balanced on the tip of a pencil (assuming uniform density and a uniform gravitational field). Formally, the centroid of a plane figure or two-dimensional shape is the arithmetic mean ("average") position of all the points in the shape. The definition extends to any object in n-dimensional space: its centroid is the mean position of all the points in all of the coordinate directions.While in geometry the term barycenter is a synonym for "centroid", in physics "barycenter" may also mean the physical center of mass or the center of gravity, depending on the context. The center of mass (and center of gravity in a uniform gravitational field) is the arithmetic mean of all points weighted by the local density or specific weight. If a physical object has uniform density, then its center of mass is the same as the centroid of its shape. In geography, the centroid of a radial projection of a region of the Earth's surface to sea level is known as the region's geographical center. The point where the three medians of the triangle intersect. The 'center of gravity' of the triangle One of a triangle's points of concurrency.Refer to the figure . Imagine you have a triangular metal plate, and try and balance it on a point - say a pencil tip. Once you have found the point at which it will balance, that is the centroid.The centroid of a triangle is the point through which all the mass of a triangular plate seems to act. Also known as its 'center of gravity' , 'center of mass' , or barycenter.A fascinating fact is that the centroid is the point where the triangle's medians intersect. See medians of a triangle for more information. In the diagram above, the medians of the triangle are shown as dotted blue lines.
Centroid facts
•The centroid is always inside the triangle
•Each median divides the triangle into two smaller triangles of equal area.
•The centroid is exactly two-thirds the way along each median.Put another way, the centroid divides each median into two segments whose lengths are in the ratio 2:1, with the longest one nearest the vertex. These lengths are shown on the one of the medians in the figure at the top of the page so you can verify this property for yourself.
Compiled By
Sanjeev Taneja
DRP Math
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Contents of this Blog
- Vedic Maths (2)
- About Srinivasa Ramanujan (1)
- Activity : Sum of all angles of quadrilateral is 360 (1)
- Activity : To find the area of parallelogram (1)
- Addition of number for kids (1)
- Angle sum property of Triangle (1)
- Area of Plane Shapes (1)
- BASIC PROPORTIONALITY THEOREM (1)
- Beauty of Mathematics (1)
- Best Team Work (1)
- Centroid of a Triangle (1)
- Class 10th - Construction (1)
- Class 10th - Construction with steps (1)
- Construction for Xth Class (1)
- Day of the Week: (1)
- Easy multiplication using vedic maths by Himanshu Sharma (1)
- Easy way to understand Squares and Square Roots (1)
- Ekādhikena Pūrvena (1)
- FORMULAE Algebra (1)
- Factorization ( Learning by Doing) (1)
- Find the Value of Dice (1)
- Formule for 10th Class (1)
- GCD (1)
- Game : PICK A NUMBER GAME (1)
- How many Squares you can find. (1)
- How to find Prime Number (1)
- Important Qutes relating Mathematics (1)
- Interesting Facts in Sale and Purchase (1)
- International Number System (1)
- Lecture of Sanjeev Kumar Taneja under Mathematics Village (1)
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- Lecture on discount of VIII telecasted at Edusat Punjab (1)
- Magic Square (1)
- Magic of Mathematics (1)
- Mathematical Fun (1)
- Mathematical Symbols (1)
- Maths Tips for All (1)
- Maths Tricks (1)
- Multiplication game for Kids (1)
- Multiplication of 2 two-digit numbers (1)
- Multiplication of 2 two-digit numbers where the tens digit of both the numbers are same and the unit digit of the two numbers sum to 10 (1)
- Multiplication of two numbers that differ by 2 (1)
- Multiplying By 101 (1)
- National ICT Award 2013 (1)
- Now Mathematics Village will become Part of Barcelona ( Spain) (1)
- Number trick with 1089 (1)
- PSEB Math Paper Set 1 2015 (1)
- Practice Questions of AP for n Terms (1)
- Proof of Pythagoras Theorem (1)
- Puzzle (1)
- Revision of discount and profit and loss 8th class telecasted on Edusat Punjab (1)
- SQUARE OF ANY TWO DIGIT NUMBER (1)
- SQUARES AND SQUARE ROOT (1)
- See this triangle contain 27 triangles (1)
- Set Theory formulas (1)
- Short cut method for Squaring Numbers between 40 and 60 (1)
- Shortcut for Multiplication by 11 (1)
- Shortcut technique to find Square root of Perfect square numbers (1)
- Solution of Puzzle (1)
- Sphere and its Surface Area (1)
- Square a 2 Digit Number Ending in 5 (1)
- Squaring by shortcut (1)
- Tangram (1)
- Telecasted on Edusat Punjab (1)
- To calculate reminder on dividing the number by 27 and 37 (1)
- To calculate reminder on dividing the number by 3 (1)
- To find the cube of numbers between 11 to 99 (1)
- Trigonometry Questions (1)
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- Video : Integers for 6th 7th students (1)
- Video : Relation Between circumference of circle and diameter (1)
- Video :Model of Pythagoras Theorem (1)
- Video on Activity (a+b)(a+b) (1)
- Video on Solution of Brackets (1)
- Video:Divisibility Test of 11 (1)
- Weights to Measure from 1 to 40 Kg (1)
- You can also find fun with numbers (1)