Question 17
The figure shows a $5\times6$ rectangular board with a missing $1\times2$ rectangle in the center. How many squares are there in the board?
Counting convention: count squares whose complete four-sided outlines consist of printed grid segments, even if they surround the central missing rectangle. Do not count squares requiring an absent boundary segment.
Original source figure, preserving its mathematical labels and arrangement.
Counting convention: count squares whose complete four-sided outlines consist of printed grid segments, even if they surround the central missing rectangle. Do not count squares requiring an absent boundary segment.
Original source figure, preserving its mathematical labels and arrangement.