Temperature Conversion

Temperature is a quantity that express the degree of heat and cold an object is a tool used to measure the temperature of the thermometer. In everyday life people tend to measure the temperature using the sense of touch. But with the development of the technology was created to measure the temperature with a thermometer valid.

The following table shows the temperature conversion formulas for conversions to and from the Celsius scale.

Example :
Temperature in the living room is 86⁰F . Calculate the temperature of living room in the C and R !

• C: R: F = 5: 4: 9,  F = 86 ⁰
• C/F= C = 5/9(86 ⁰  -32 ⁰ ) = 5/9 x 54 ⁰  = 212 ⁰ C
• R/F=4/9 =R = 4/9(86 ⁰  -32 ⁰ ) = 4/9 x 54 ⁰  = 24 ⁰ R
• So, 86 ⁰ F =30 ⁰ C =24 ⁰ R

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Calculating the Area of a Square

In geometry, a square is a regular quadrilateral. This means that it has four equal sides and four equal angles (90-degree angles, or right angles). It can also be defined as a rectangle in which two adjacent sides have equal length. A square is quadrilateral (Quadrilateral just means "four sides" quad means four, lateral means side).with :

• Four equal sides and four equal angles
• Opposite side that are parallel
• Two diagonal that bisect at right angles
• Four lines of symmetry

The area of a square can be found by multiplying the base times itself. This is similar to the area of a rectangle but the base is the same length as the height.
If a square has a side of length 7 cm its area is 7*7=49 square cm.

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Area of A Rectangle

A rectangle is a parallelogram with 4 right angles.  Now, since a rectangle is a parallelogram, its opposite sides must be congruent and it must satisfy all other properties of parallelograms .
1.  4 Right Angles, In a rectangle all angles are 90°

2. The diagonals of a rectangle are congruent (congruent means that objects have 

     the same shape. It does not mean that they are 'equal', exactly).

To find a diagonal using the Pythagorean theorem :
For example, a rectangle has a length of 12 cm and width 5 cm. How long the diagonal ?

The area of a rectangle can be found by multiplying the length times the width. The formula is: A= l * w, where  A is the area,  l is the length,  w is the width, and * means multiply. If a rectangle has a base of  length 10 cm and a width of 5 cm, its area is 10*5= 50 square cm :


Area = lenghth * width
          = 10 * 5
          = 50 cm

If the area of ​​the rectangle is known, to find the length and width can be done as follows:

#Note: one of the elements must be known, for example, the length element .

Area of Rectangle = 120 cm. What is the length ?

Length = Area/Width

              = 120/ 12

              = 10 cm

Do it the same way if the element width is already known

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Square Root of a Number

Square Root of a Number. Before understanding what the square root of a number is, it is important to understand the meaning of root of a number. The root of a number is an equal factor of the number. For example, find the root of 25

First, we need to factor 25 :
25 = 1 × 25
25 = 5 × 5
The root of 25 is 5 because 5 is the equal factor for 25
We call 5 the square root of 25
The symbol : √


How to find the square root :
1. Trial and error. 
This is the most common way to resolve the matter of the square root and is suitable for children who have been smoothly calculate the square or multiplication. For example we will calculate the square  roots 64.
a.  So we try 5 × 5 = 25 (too small).
b.  Try the 9 × 9 = 81 (too big).
c.  Try the 7 × 7 = 49 (too small).
d.  Try the 8 × 8 = 64 (right).    
     So we get the square root of 64 is 8.

2.  Factorization. 
This method is quite attractive and practical.  For example, what is the root of 64    
64 => 2 × 32
     => 2 x 2 x 16
     = 4 × 16
Then the root of 64 => root 4 x root 16                            
    => 2 x 4 => 8
3. Approaching

This method is a variation and the continuation of trial and error. After practicing a few times, we will be very proficient in this way.For example, what is the root of 1681?    

The most sensible approach is 40 × 40 = 1600.     

Because the unit value of 1681 is 1 so the roots of the unit 1 or 9.     

In this case we choose 1.  So we get the answer 40 +1 = 41  ( 41 x 41 = 1681)

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