This is a basic site for dealing with programming help. I will just post anything, on programming, that I have learnt something new. Guess that would be useful to you also. I'm going to use this as a repository for storing valuable programming tips, that I suddenly find it difficult to locate it, either in my PC or in the Net.
Happy learning.. :o). Check out my old blog .. http://edwardanil.blogspot.com
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Monday, January 12, 2015
25 Math Concepts You Absolutely Need to Know
The area of a circle isA= πr2, whereris the radius of the circle.
The circumference of a circle isC= 2πr, whereris the radius of the circle. The circumference can also be expressed as πd, because the diameter is always twice the radius.
The area of a rectangle isA=lw, wherelis the length of the rectangle andwis the width of the rectangle.
The area of a triangle isA= ½bh, wherebis the base of the triangle andhis the height of the triangle.
The volume of a rectangular prism isV=lwh, wherelis the length of the rectangular prism,wis the width of the rectangular prism, andhis height of the rectangular prism.
The volume of a cylinder isV= πr2h, whereris the radius of one of the bases of the cylinder and his the height of the cylinder.
The perimeter is the distance around any object.
The Pythagorean Theorem only applies to right angles and states thatc2=a2+b2, wherecis the hypotenuse of the triangle and aandbare two sides of the triangle.
The following are angle measures and side lengths for Special Right Triangles:
In an equilateral triangle, all three sides have the same length, and each of the angles equals 60°.
In an isosceles triangle, two sides have the same length, and the angles opposite those sides are congruent.
The complete arc of a circle has 360°.
A straight line has 180°.
A prime number is any number that can only be divided by itself and 1.
Squaring a negative number yields a positive result.
To change any fraction to a decimal, divide the numerator by the denominator.
If two numbers have one or more divisors in common, those are the common factors of the numbers.
To calculate the mean, or average, of a list of values, divide the sum of the values by the number of values in the list.
The median is the middle value of a list of numbers that is in either ascending or descending order.
The mode is the value that appears the greatest number of times in a list.
A ratio expresses a mathematical comparison between two quantities. (1/4 or 1:4)
A proportion is an equation involving two ratios. (1/4 =x/8 or 1:4 =x:8)
When multiplying exponential expressions with the same base, add the exponents.
When dividing exponential expressions with the same base, subtract the exponents.
When raising one power to another power, multiply the exponents.