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The law of sines is used to find angles of a general triangle. If two sides and the enclosed angle
are known, it can be used in conjunction with the law of cosines to find the third side and the other
two angles.
Figure 2.9: Law of Sines
2.3 RECTANGULAR COMPONENT
The rectangular components of a vector F refer to vectors along the x and y axes that add up to
F.
Figure 2.10: Rectangular Component
The rectangular components of a vector are those two vectors in red and blue. They're the vectors
in the x and y directions that, when added, make the vector F can be find. Because they're just in
the x and y directions, their magnitudes are easy to find. Just look at their coordinates. The blue
one is (0,3) and had magnitude 3. The red one is (4,0) with magnitude 4.
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