On the xy-coordinate plane, what is the area of a right triangle, one side of which is defined by the points (2,3) and (-4,0)? (1) The triangle's sides cross the y-axis at exactly two points altogether. (2) The y-coordinate of the third vertex of the triangle is zero 请问（1）是什么意思？麻烦哪位翻译一下中文。谢了。 | 
