ISEE Lower Level Quantitative Reasoning › How to find perimeter
What is the perimeter of the rectangle below?
The formula for perimeter of a rectangle is
To solve for the perimeter we can plug our known values into the equation.
The perimeter of a triangle is 14 inches. One side is 4 inches long. Another side is 5 inches long. How long is the 3rd side?
Add up all of the sides of a triangle to get the perimeter. Here, 2 of the sides add up to give you 9 inches. The third side must equal the difference between 14 inches and 9 inches.
Daria found the perimeter of the below trapezoid to be 29 inches.
What is the length of the missing side?
To find the perimeter of a trapezoid, add up the lengths of its four sides. In the given trapezoid,
To find the missing side, combine like terms and solve for :
The missing side of the trapezoid is long.
What is the perimeter of the equilateral triangle below?
An equilateral triangle means that all of the side lengths are the same. To find the perimeter, we can take the one known side length and multiply by (since there are
sides) or we can add the side length to itself
times.
What is the width of the rectangle if the perimeter is and the length is
?
The formula for perimeter of a rectangle is
To solve for the width we can plug our known values into the equation.
Subtract from both sides
Divide by both sides
What is the perimeter of the triangle below?
To find the perimeter, we add all of the side lengths together.
What is the perimeter of the polygon below?
To find the area of a perimeter, we add all of the side lengths together.
What is the perimeter of the polygon below?
To find the area of a perimeter, we add all of the side lengths together.
What is the perimeter of the polygon below?
To find the area of a perimeter, we add all of the side lengths together.
A square has a perimeter of , what is the lengthh of one side?
The perimeter of a square is the sum of all of its sides. Since a square has four equal sides, the length of one side can be multiplied by four to find the perimeter.
In this problem, however, we are given the perimeter and must find the side.
Therefore, we should divide to find the missing side.