Question 124
Find the number of rectangles satisfying the following properties:
(α) Their vertices are points $(x, y)$ of the plane $Oxy$, with $x, y$ non-negative integers and $x \le 8$, $y \le 8$.
(β) Their sides are parallel to the axes.
(γ) Their area $E$ satisfies: $30 \lt E \le 40$.
(α) Their vertices are points $(x, y)$ of the plane $Oxy$, with $x, y$ non-negative integers and $x \le 8$, $y \le 8$.
(β) Their sides are parallel to the axes.
(γ) Their area $E$ satisfies: $30 \lt E \le 40$.