[計量] 一題數學問題
Right triangle PQR is to be consturcted in the XY-plane so that the
right angle is at P and PR is parallel to the x-axis. The x- and y-
coordianates of P, Q, and R are to be integers that satisfy the
inequailiies -4小於等於X小於等於5 and 6小於等於Y小於等於16
How many different triangles with these properties could be concturcted?
Answer : 9900
這題我一直抓不到訣竅 請問前輩們該如何解？
謝謝
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