Question

question 9
a square is plotted with its vertices at (1, 1), (1, 5), (5, 1), and (5, 5).
what is the perimeter of the square?
12 units
16 units
8 units
20 units

Explanation:

Step1: Calculate side length

Take two adjacent vertices, e.g., $(1,1)$ and $(1,5)$. The side length $s$ is the difference in y-values:
$s = |5 - 1| = 4$

Step2: Compute perimeter of square

Perimeter $P$ of a square is $4 \times$ side length:
$P = 4 \times s = 4 \times 4$

Answer:

B. 16 units