[計量] 請問一題
Right triangle PQR is to be constructed in the xy-plane so that the right
angle is at P and PR is parallel to the x-axis. The x- and y-coordinates of P,
Q, and R are to be intergers that satisfy the inequalities -4 ≦ x ≦ 5 and
6 ≦ y ≦ 16. How many different triangles with these properties could be
constructed?
(A) 100
(B) 1100
(C) 9900
(D) 10000
(E) 12100
答案是 (C) 拜託各位囉
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