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单选题
Which one of the following is a counterexample to the statement “If two angles are supplementary, then they are right angles?”
A

If two angles are complementary, then they are not right angles.

B

If two angles are fight angles, then they are supplementary.

C

If two angles are not supplementary, then they are not right angles.

D

If two angles are supplementary, then one could measure 100° and one could measure 80°.

E

If two angles are not fight angles, then they are not supplementary.

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参考解析
解析：
A counterexample is an example that proves a statement to be false. Answer D shows one example where angles are supplementary but are not right angles, since one measures 100° and the other measures 80°.
更多 “单选题Which one of the following is a counterexample to the statement “If two angles are supplementary, then they are right angles?”A If two angles are complementary, then they are not right angles.B If two angles are fight angles, then they are supplementary.C If two angles are not supplementary, then they are not right angles.D If two angles are supplementary, then one could measure 100° and one could measure 80°.E If two angles are not fight angles, then they are not supplementary.” 相关考题
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