Trigonometrical Angles and Ratios Formula [Pdf]

                        TRIGONOMETRY

•Trigonometry is a very important branch of mathematics. IT deals with the angles of a triangle and the measure of all sorts of positive and negative angles which falls within the perview of the subject.

Measurement of Trigonometrical Angles:

•systems of measuring Angles:

1.sexagesimal system (or English system):

In this system,

    1 right angle = 90 degrees (or 90°)

1 degree (or 1°) = 60 minutes (or 60')

1 miniute (Or 1') = 60 seconds (or 60°)

2. Centesimal system:

  Radian:

In any circle , the angle subtended at it's centre by an arc of the circle whose length is equal to the radius of the circle is called a radian.

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