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**Neha****Member**- Registered: 2006-10-11
- Posts: 173

Find Angle A if three times its complement equals 150degrees .

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**pi man****Member**- Registered: 2006-07-06
- Posts: 251

An angle plus its complement is always equal to 90. In this case, 3 times the complement is 150 degrees, so the complement is 50 degrees. 50 + A = 90, therefore A = 40.

*Last edited by pi man (2007-01-09 16:19:54)*

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**Toast****Real Member**- Registered: 2006-10-08
- Posts: 1,321

Well, seeing as complementary angles add up to 90 degrees and you have three times one of the angles, you can draw these algebraic conclusions:

**1.**

**2.**

re-arranging gives:

You can now use simultaneous equations to find angle A.

EDIT: Guess pi man beat me to it

*Last edited by Toast (2007-01-10 16:24:42)*

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