[請教] M3的數學一題
Right triangle PQR is to be constructed in the XY-plane so that 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 integers 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C
想請問題目如何解釋??還有如何算出答案??
感激不盡^^~~
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