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Pythagorean triple
A set of nonzero whole numbers a,b, and c that satisfy the equation
Example: 3,4,5 ; 5,12,13

Trigonometric ratios
Similar right triangles have equivalent ratios for their corresponding sides.
Example: sine, cosine, tangent




Angle of elevation
the angle formed by a horizontal line and the line of sight to an object above the horizontal line.

Angle of depression
the angle formed by a horizontal line and the line of sight below the horizontal line.

Vector
Any quantity with magnitude (size) and direction.

Magnitude
corresponds to the distance from the initial point K to the terminal point W.

Initial point
beginning point (K)

Terminal point
The ending point (W)

