题目:
Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and is parallel to the x-axis. The x- and y-coordinates of P, Q, and R are to be integers that satisfy the inequalities-4 ≤ x≤ 5and 6≤y≤16. How many different triangles with these properties could be constructed?
选项:
A、110
B、1,100
C、9,900
D、10,000
E、12,100
答案:
C