Perimeter of a Triangle Practice
Question 2
Given the perimeter of a triangle is 18ft. Its side lengths are
5ft, 7ft and x ft. Find x.
Answer
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Step by Step Solution
Step 1
The picture below shows the triangle:
Step 2
We start with the formula for the perimeter of a triangle, P,
as shown below:
as shown below:
Step 3
Since the values of the perimeter and the side lengths are given, we can substitute these values into the formula as shown:
Step 4
To find x, we need to remove 12. To do so, we add -12 to both sides of the equation:
Step 5
Now, we have x = 6. Remember that, it is important to include the unit. Hence:
x = 6ft
Step 6
Therefore, the answer is B.
To close the steps,
perimeter of a triangle practice page
