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Basic Trigonometry

 

trigonometry

Trigonometry investigates the relationship between the sides and the angles in triangles. These special relationships are used in calculus, engineering and physics. So, it is necessary to understand and know these relationships.

The Right Triangle and the Pythagorean Theorem

A right triangle is one that has a right angle. The side opposite the right angle is called the hypotenuse and the other two sides are referred to as legs.

 The Pythagorean Theorem states the sum of the squares of the legs is equal to the square of the hypotenuse:   a2 + b2 = c2   

trigonometry

Basic Functions

sine (sin) is the ratio of the side opposite and the hypotenuse

sine

cosine (cos) is the ratio of the side adjacent and the hypotenuse

cosine

tangent (tan) is the ratio of the side opposite and the side adjacent

tangent

REMEMBER: SOH CAH TOA