GWD数学 一小题

fudanwyh

貌似很简单的一题，确认下是不是答案错啦？ 答案选E。谢谢！
Q18:

In isosceles triangle PQR, if the measure of angle P is 80º, which of the following could be the measure of angle R?


I.20ºII.50º III.80º


A.I only
B.III only
C.I and II only
D.II and III only
E.I, II, and III

fudanwyh

弄明白了，答案没错。
下次想久点再发帖。