[b]Introduction (Motivation):[/b][br]When drawing a diagonal on a grid, how many squares does it pass through? [br]This question is key in computer graphics, where images are made of tiny square pixels. [br]Let’s explore how a diagonal moves through a grid, just like how a computer decides which pixels to light up![br][br][b]Activity Instruction: [/b][br]Drag the upper-right corner of the rectangle to change its size. [br]Count how many squares (highlighted in orange) the diagonal crosses. [br]Can you find a pattern?