Introduces terminology associated with a right-angled triangle
Explains the Pythagoras theorem for finding sides of a right-angled triangle
Defines the trigonometric ratios sine, cosine, and tangent to find angles and the sides of a Right-angled triangle.
Explains what is meant by trigonometric identities and gives a list of essential formulae
Explains the concept of the Radian measure to find arc length and the area of a sector
Introduces sine and cosine rules to find the trigonometric ratio to an angle greater than or less than 90°
Explains bearing problems
7.1 Introduction
Tri (three) Gono (angels) Metry (To measure)
An important area of mathematics called trigonometry examines how triangles’ sides and angles relate.
The word trigonometry comes from a 16th-century Latin derivative of the Greek words for the triangle (trigon) and measure (metron). In ancient times, the Greeks introduced trigonometry to answer questions like how far is it? And in what direction? Trigonometry deals with lines (which measure distance) and angles (which indicate direction).
Though the field emerged in Greece initially in the third century BC, the most critical developments and contributions (For example: the sine function) have come from India in the fifth century AD. It is unknown whether Indian scholars created trigonometry independently or under the ...
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