What is the Area Rule?
- Normally we're used to finding the area of a triangle through 1/2bh, where b is the length of the base and h is the height perpendicular to the base.
- However, sometimes these values aren't available, in which case the area rule can be used.
- The area rule uses sine to find the perpendicular height when only the other sides are known.

- h is substituted with bcsin(A).