Answer: 13.6
Explanation:
To find the length of the third side of a triangle when the perimeter is given, subtract the sum of the lengths of the known sides from the total perimeter.
Given:
Perimeter = 36.9 inches
Side 1 = 9.7 inches
Side 2 = 13.6 inches
Let's calculate the length of the third side:
Perimeter = Side 1 + Side 2 + Side 3
36.9 = 9.7 + 13.6 + Side 3
We can rearrange the equation to solve for Side 3:
Side 3 = Perimeter - (Side 1 + Side 2)
Side 3 = 36.9 - (9.7 + 13.6)
Side 3 = 36.9 - 23.3
Side 3 = 13.6
Therefore, the length of the third side is 13.6 inches.