Q:
In triangle ABC, point X is the midpoint of side AC and point Y is the midpoint
of side BC. If point R is the midpoint of line segment XC and if point S is the
midpoint of line segment YC, what is the area of triangular region RCS?
(1) The area of triangular region ABX is 32.
(2) The length of one of the altitudes of triangle ABC is 8.
答案是Ａ
但是我隨便畫一個三角形 怎麼知道Ａ要怎麼求呢？
謝謝