Basically, the perimeter of a shape is the total legnth of all it's sides, therefore to write an expression for it, you need to get the legnths of the sides (even if there is a letter (eg: n)), then put them into an expression.
For instance:
A polygon has 2 sides that are 15cm long, 1 side that is 22cm long, 4 sides that are n long and 3 sides that are a long. To write the expression for the perimeter of this polygon as basically as possible, you would write:
15cm + 15cm + 22cm + n + n + n + n + a + a + a
Now you need to simplify it:
52cm + 4n + 3a
If you were asked this question, you would write 52cm + 4n + 3a as your answer. That is an expression for the perimeter of that particular polygon. If you apply the same theory to any question like the one you asked about, you would get it right.
How do you write an expression
To calculate the perimeter, by definition, you must add up all the sides. The details, of course, vary from case to case. For example, if you have an arbitrary triangle, the expression would be something like side1 + side2 + side3 (or whatever the sides are called). In some cases you can simplify the resulting expression; in an isosceles triangle, you have two equal sides, so you get an expression similar to a + a + b = 2a + b. In a rectangle, opposite sides are equal, so you get perimeter = a + b + a + b = 2a + 2b or 2 (a + b).
call width x so length is 3x perimeter is (2*length)+(2*width) so perimeter is 8x
Perimeter means the distance around the outside of a shape.
Write an equation for the perimeter, and solve it. Remember that the perimeter is the sum of all four sides.
Perimeter = Sum(length of each side), where the summation is over all the sides.
The perimeter of a rectangle is the sum of the four sides.
Perimeter covers the boundary line of any plane figure.
6x-14
How do you write an expression
To calculate the perimeter, by definition, you must add up all the sides. The details, of course, vary from case to case. For example, if you have an arbitrary triangle, the expression would be something like side1 + side2 + side3 (or whatever the sides are called). In some cases you can simplify the resulting expression; in an isosceles triangle, you have two equal sides, so you get an expression similar to a + a + b = 2a + b. In a rectangle, opposite sides are equal, so you get perimeter = a + b + a + b = 2a + 2b or 2 (a + b).
A numerical expression is an expression that uses number. For example, if a teacher told you to write four plus six subract two , you would simply write it in number form. 4+6-2.
P = 5s, where s is the length of a side. This applies to a regular pentagon. If the pentagon is irregular then P = (s1 + s2 + s3 + s4 + s5)
how do you write an expression with three terms
That probably means that you describe something in words.
the same : expression
Perimeter.