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题库 / Prep2007E1-DS-62
In isosceles ~$\Delta $~RST what is the measure of ~$\angle $~R ?
(1) The measure of ~$\angle $~T is 100°.
(2) The measure of ~$\angle $~S is 40°.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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脑子瓦特了。
1）就知道剩下那两个角肯定是相等的两个，因为合为180. 做的时候还在想我怎么知道这哪个角是相等的两个？三角形命名规则？
卧槽，真是瓦特了。
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