Elliot is building a sandbox in the shape of a triangle. A model of the sandbox is shown. Which expression represents the perimeter of Elliot's sandbox?
To find the perimeter of the sandbox, we need to add up the lengths of all three sides of the triangle.
The top side of the triangle is 7 feet long.
The left side of the triangle is 12 feet long.
The right side of the triangle is 12 feet long.
We can add up these three side lengths to find the total perimeter:
$7+12+12=31$.
So the expression that represents the perimeter of Elliot's sandbox is $\boxed{31}$.
To find the perimeter of Elliot's sandbox, we need to calculate the sum of the lengths of all three sides of the triangle. Since the model of the sandbox is not provided, I cannot provide an expression representing the perimeter. However, if the lengths of the sides of the triangle are given, you can simply add them to calculate the perimeter.
To find the perimeter of Elliot's sandbox, we need to calculate the sum of all the side lengths of the triangle.
Looking at the model of the sandbox, we can identify that it is an isosceles triangle, which means it has two sides of equal length.
Let's assume that the length of the two equal sides is denoted by "a", and the base of the triangle is denoted by "b".
To find the perimeter, we need to sum all three sides, which are "a", "a", and "b".
Hence, the expression that represents the perimeter of Elliot's sandbox is: 2a + b.