Posted by **Alisha** on Thursday, December 8, 2011 at 3:02pm.

In an oblique triangle ABC, A=30 degree, and the perpendicular from C to AB is 12 inches long. Find the length of AB.

- Math- Trig -
**Damon**, Thursday, December 8, 2011 at 4:35pm
tan 30 = 12/AB

- Math- Trig - eh? -
**Steve**, Thursday, December 8, 2011 at 4:56pm
Actually, you don't say that B is at the foot of the perpendicular. All we know is that the altitude from C to AB is 12. There is nothing to say how long AB is.

In fact, we are told that ABC is an oblique triangle, indicating that it is fact **not** a right triangle.

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