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The area K of triangle ABC is given by:

K = 1/2ab(SinC) when
K = Area of a triangle a = one side b = another side SinC = sine of included angle 
Use when a sideangleside (SAS) triangle is given.

The SEGMENT of a circle is:

the region bound by an arc of a circle it's chord.


The Law of Sines

in triangle ABC:
sinA/a = sinB/b = sinC/c when A= degrees of angle A a= measure of segment a... 

In an SAS triangle,

(side opposite A)² =
(side adjacent to A)² + (other side adj. to A)²  2(side #1 X side #2)Cos(angle) 
Law of Cosines

What is a course?

an angle measured from North, to the direction of the transportation vehicle.
