天山03-18

[isistseng]

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


I. 20 degree
II.50 degree
III.80 degree


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

Ans.E

我想請問一下為什麼I.20度可以？？

首次發問,請大家多多幫忙.謝謝！

[FrankChang]

80,80,20
題目沒限定P是等腰三角形中的哪一個角

[isistseng]

我知道問題在哪了,謝謝！

真是蠢到一個不行