Circumference of a Circle

Here is the formula to calculate circumference of a circle 

2 π r OR π d

Where r is the Radius of a Circle and d is the Diameter of a Circle... 

For example : Let the Radius of  a Circle be 5cm 

 So, Circumference of a circle = 2 x 3.141592 x 5

i.e.,  31.41592 cm

Here is a Program to Calculate Circumference of a Circle...

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Perimeter of a Triangle

Here is the formula to find the Perimeter of a Triangle....

Perimeter of a Triangle = a + b + c

where a, b and c are the side lengths of the triangle.

For example : Suppose the length of the sides are 5cm, 6cm and 10cm

Perimeter of the Triangle = 5 + 6 + 10

i.e., 21 cm

Here is the Program to Calculate the Perimeter of a Triangle..

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Perimeter of a Rectangle

Here is the formula to find the Perimeter of a Rectangle...

  

Perimeter of a Rectangle = 2a + 2b

where a and b are the breadth and height respectively...

For example : Suppose the breadth of a rectangle is 5 cm.

and height of a rectangle is 6cm.

so the Perimeter of a Rectangle = 2x5 + 2x6

i.e.,  22cm.

Here is the program to calculate the Perimeter of a Rectangle...

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Perimeter of a square

Here is the formula to find the Perimeter of a Square...

Perimeter of a Square = 4 x (Length of a Side)

For example : Suppose the length of a side is 5 cm.

so the perimeter of a square = 4 x 5.

i.e., 20 cm.

Here is the program to calculate the Perimeter of a Square..

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Calculate Area of Square, Area of Parallelogram, Area of Trapezoid, Area of Circle and Area of Ellipse

Here are some formulas to calculate Area of Square, Area of Parallelogram, Area of Trapezoid, Area of Circle and Area of Ellipse...

Note :-  a =  Side of a square.
             b =  Breadth.
             h =  Height.
             r =  Radius

Formulas

Square = a 2
Parallelogram = b*h
Trapezoid = 1/2* (b1 + b2)*h
Circle = π r 2
Ellipse = π r1 r2

Click on the Buttons to find Area of Square, Area of Parallelogram, Area of Trapezoid, Area of Circle and Area of Ellipse.


1) Click on the button to find the


2) Click on the button to find the


3) Click on the button to find the



4) Click on the button to find the



5) Click on the button to find the







Note : I have considered the value of π upto 3.14159265 in the above programs.

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Kaprekar Number

D.R.Kaprekar

Kaprekar Number 6174

Rules :

•  Select any four digit number, but do not select the numbers like 1111, 2222, 3333,...



•  Arrange the digits in decreasing order.



•  Now arrange the digits in ascending order.



•  Subtract the smaller number from the larger number.



•  Repeat the steps until you get 6174 in repetition.

For Example :- Lets take a number 1234


Step 1:-  Arranging the digits in descending order we get 4321.

Step 2:-  Arranging the digits in ascending order we get 1234.

Step 3:-  Subtract 1234 from 4321 = 4321 - 1234 =  3087.

Step 4:-  Arranging the digits in descending order we get 8730.

Step 5:-  Arranging the digits in ascending order we get 0378.

Step 6:-  Subtract 0378 from 8730 = 8730 - 0378 = 8352.

Step 7:-  Arranging the digits in descending order we get 8532.

Step 8:-  Arranging the digits in ascending order we get 2358.

Step 9:-  Subtract 2358 from 8532 = 8532 - 2358 =6174

Step 10:- Arranging the digits in descending order we get 7641.

Step 11:-  Arranging the digits in ascending order we get 1467.

Step 12:-  Subtract 1467 from 7641 =  7641 - 1467 = 6174.

 

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You will find that all four digit number using kaprekar rule will reach the number 6174

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Birthday Date Calculation

   Birthday Date Calculation Trick

Step  1: Add 18 to your birth month.



Step  2: Multiply by 25.



Step  3: Subtract 333.



Step  4: Multiply by 8.


Step  5: Subtract 554.


Step  6: Divide by 2.


Step  7: Add your birth date.


Step  8: Multiply by 5.


Step  9: Add 692.


Step  10: Multiply by 20.



Step  11: Add only the last two digits of your birth year.



Step  12: Subtract 32940 to get your Birthday.

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Angel Number

Angel Number 421

Step 1 :- Select any whole number 


Step 2 :- Suppose a whole number is even then divide it by 2.
               If it is odd then multiply by 3 and add 1.


Step 3 :- Repeat the step 2 till you get the loop value 4,2,1 in repetition.

For Example :- Let us consider a whole number 15.

 As 15 is an odd number so (15 × 3) + 1 = 46.


Now 46 is an even number so (46 / 2) = 23.


Again 23 is an odd number so (23 × 3) + 1 = 70.


70 is an even number so (70 / 2) = 35.


35 is an  odd number so (35 × 3)  + 1 = 106.


106 is an even number so (106 / 2) = 53.


53 is an odd number so (53 × 3) + 1 = 160.


160 is an even number so (160 / 2) = 80.


80 is an even number so ( 80 / 2 ) =40.


40 is an even number so ( 40 / 2 ) = 20.


20 is an even number so ( 20 / 2 ) = 10.


10 is an even number so ( 10 / 2 ) = 5.


5 is an odd number so ( 5 × 3 ) + 1 = 16.


16 is an even number so (16 / 2) = 8.


8  is an even number so ( 8 / 2) = 4.




4 is an even number so ( 4 / 2 ) = 2.




2 is an even number so ( 2 / 2 ) = 1.




1 is an odd number so (1 × 3 ) + 1 = 4.


4 is an even number so ( 4 / 2 ) = 2.




2 is an even number so ( 2 / 2 ) = 1.

                     .
                       .
                     .
                       .
                     .
                       .
                     .
                       .

so the number 4 , 2 , 1 goes on............


Note :- The angel number 421 is the smallest prime formed by the two powers in logical order from right to left.

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