The length of a rectangle is 3 times its width. If the area of the rectangle is #"192 in"^2#, how do you find its perimeter?
The perimeter is
First find the lengths of the sides of the rectangle
Use the information about
Begin by finding a way to describe each side using math language.
Width . . . . . . . . .
The area is the product of these two sides
[ width ]
[ . .
1) Clear the parentheses by distributing the
2) Divide both sides by
3) Take the square roots of both sides
The width cannot be a negative number, so
The width of the rectangle is
So the length must be
Now use the lengths of the sides of the rectangle to find its perimeter
Perimeter is the sum of all four sides
1) Clear the parentheses
1) The sides should multiply up to an area of
Impact of this question
Creative Commons License