题目
If the figure 6 is composed of 24 equilateral triangles，then how many non-congruent distinct right triangles with vertices on the intersecting points are possible in this figure（ ）
If the figure 6 is composed of 24 equilateral triangles，then how many non-congruent distinct right triangles with vertices on the intersecting points are possible in this figure（ ）A.
3
B.
4
C.
5
D.
6
知识点：加法原理与乘法原理章节：数学竞赛 / 逻辑推理问题