Final answer:
The measurement of the last side of a plot of land with three known sides and a total perimeter of 67 meters is calculated to be 22 meters.
Step-by-step explanation:
To determine the measurement of the last side of the plot of land, we can use the perimeter formula for a four-sided figure (quadrilateral). The perimeter is the total distance around the plot and is given as the sum of all four sides. We are provided with the measurements of three sides and the total perimeter, which can be expressed as:
P = Side A + Side B + Side C + Side D
Substituting the values we have:
67 meters = 12 meters + 15 meters + 18 meters + Side D
Combining the known side lengths:
67 meters = 45 meters + Side D
Now, we can solve for Side D:
Side D = 67 meters - 45 meters
Side D = 22 meters
Therefore, the measurement of the last side is 22 meters, which corresponds to option C.