Question

what is the perimeter of square bcde?

Explanation:

Step1: Determine side - length of square

Count the grid units between two adjacent vertices. For example, between B and C, moving horizontally from B(3, 10) to C(3, 5), the side - length $s$ of the square is $10 - 5=5$ units.

Step2: Use perimeter formula for square

The perimeter $P$ of a square is given by $P = 4s$. Substitute $s = 5$ into the formula. So $P=4\times5$.

Answer:

20