Posted by **Lisa** on Thursday, May 27, 2010 at 11:40pm.

Is it always true, sometimes true, or never true that two complementary angles have a common vertex?

- geometry -
**Jen**, Friday, May 28, 2010 at 12:54am
I believe that it is always true. Complementary angels add up to 90 degrees.

- geometry -
**Jen**, Friday, May 28, 2010 at 12:55am
Wait, sometimes true.

- geometry -
**drwls**, Friday, May 28, 2010 at 8:06am
Sometimes. The angles can be anywhere in a figure as long as they add up to 90 degrees. Consider for example the acute angles of a right triangle

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