The physical education teacher marked off a triangular section of the gym to play a game. Two of the triangle's sides were 7 feet and 9 feet respectively. If the perimeter of the triangle is 22 feet, what is the measure of the triangle's third side?
22 - 16 = ?
To find the measure of the triangle's third side, we need to use the information given in the problem. The perimeter of a triangle is the sum of all its sides. In this case, the perimeter of the triangle is given as 22 feet.
Let's denote the length of the third side as x. We know that the other two sides are 7 feet and 9 feet. So, we can set up an equation as follows:
7 + 9 + x = 22
To solve for x, we need to isolate it on one side of the equation. Subtracting 7 and 9 from both sides, we get:
x = 22 - 7 - 9
x = 6 feet
Therefore, the measure of the triangle's third side is 6 feet.