Question

what are the area and perimeter of square cdef?
area = $square$ square units
perimeter = $square$ units

Explanation:

Step1: Find side length of square

Count grid units between points, e.g., $D(5,8)$ to $E(5,3)$: $8-3=5$ units.

Step2: Calculate area of square

Area formula: $\text{Area} = s^2$, where $s=5$.
$\text{Area} = 5^2 = 25$

Step3: Calculate perimeter of square

Perimeter formula: $\text{Perimeter} = 4s$, where $s=5$.
$\text{Perimeter} = 4\times5 = 20$

Answer:

Area = 25 square units
Perimeter = 20 units