Perimeter Formulas
The perimeter of any polygon is the sum of the lengths of all the sides.
Note: "ab" means "a" multiplied by "b". "a²" means "a squared", which is the same as "a" times "a".
The perimeter of a circle is more commonly known as the circumference.
The perimeter of any polygon is the sum of the lengths of all the sides.
Note: "ab" means "a" multiplied by "b". "a²" means "a squared", which is the same as "a" times "a".
square = 4a 
rectangle = 2a + 2b
triangle = a + b + c
Circle = 2pi r
circle = pi d (where d is the diameter)
circle = pi d (where d is the diameter)
The perimeter of a circle is more commonly known as the circumference.
For example, if you need to find the perimeter of a rectangle with sides of 9 inches and 1 foot, you must first change to the same units.
perimeter = 2 ( a + b)
INCORRECT
perimeter = 2(9 + 1) = 2*10 = 20
CORRECT
perimeter = 2( 9 inches + 1 foot)
= 2( 3/4 foot + 1 foot )
= 2(1 3/4 feet)
= 3 1/2 feet
perimeter = 2 ( a + b)
INCORRECT
perimeter = 2(9 + 1) = 2*10 = 20
CORRECT
perimeter = 2( 9 inches + 1 foot)
= 2( 3/4 foot + 1 foot )
= 2(1 3/4 feet)
= 3 1/2 feet
| Hope you like the above example of Perimeter Formulas. |
| Please leave your comments, if you have any doubts. |
Wow, this was very interesting. Especially, that I wasn't aware that such a big set of numbers can be written as a fraction. I actually sat down and tried to do a fraction out of a big set of numbers and it worked. Thank you for the great information!
ReplyDeleteEven a big, clunky fraction like 7,324,908/56,003,492 is rational, simply because it can be written as a fraction.