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Trigonometry Basics: Sine, Cosine, Tangent, Laws, and Formulas

   

Added on  2021-08-30

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Trigonometry Basics: Sine, Cosine, Tangent, Laws, and Formulas_1

•Trigonometry ... is all about triangles.
•A triangle has three sides and three angles
•The three angles always add to 180°
Trigonometry Basics: Sine, Cosine, Tangent, Laws, and Formulas_2

Right Angled Triangles
•A right angled triangle is (you guessed it), a
triangle that
has a right angle (90°) in it.
•The little square in the corner tells us that it is
a right angled triangle
(I also put 90°, but you don't need to!)
Trigonometry Basics: Sine, Cosine, Tangent, Laws, and Formulas_3

Names
And we give names to each side:
Adjacent is adjacent (next to) to the angle θ
Opposite is opposite the angle θ
the longest side is the Hypotenuse
Trigonometry Basics: Sine, Cosine, Tangent, Laws, and Formulas_4

Trigonometry Basics: Sine, Cosine, Tangent, Laws, and Formulas_5

"Sine, Cosine and Tangent"
•Trigonometry is good at find a missing side or
angle in a triangle.
•The special functions Sine, Cosine and
Tangent help us!
•They are simply one side of a triangle divided
by another.
Trigonometry Basics: Sine, Cosine, Tangent, Laws, and Formulas_6

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