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Adding and Subtracting Vectors
 Addition: Head to Tail
 Subtraction: Add negative of one vector

Length of Side
Opposite of angle
O = Hsinθ

Length of Side
Adjacent to angle
A = Hcosθ

Special Triangles
Lengths of a 30, 60, 90 trigangle

Special Triangles
Lengths of a 45, 45, 90 triangle

Special Triangles
Derived from Pythagorean Theorem
sp


Sine Values
sin30^{o}
0.5

Sine Values
sin45^{o}
1/(2)^{1/2} = 0.7

Sine Values
sin60^{o}
(3)^{1/2}/2 = 0.85



Cos Values
cos30^{o}
(3)^{1/2}/2 = 0.85

Cos Values
cos45^{o}
1/(2)^{1/2} = 0.7



