 # NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry

## NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry - Free PDF

1. What are the basics of trigonometry?

The basic of trigonometry are –

 NAME ABBREVIATION RELATIONSHIP Sine Sin Sin (θ)= Opposite/Hypotenuse Cosine Cos Cos (θ)= Adjacent/Hypotenuse Tangent Tan Tan (θ)= Opposite/Adjacent Cosecant Cosec Cosec ( θ)= Hypotenuse/Opposite Secant Sec Sec ( θ) = Hypotenuse/Adjacent Cotangent Cot Cot ( θ) = Adjacent/ Opposite

2. What do you mean by trigonometry?

• As the name suggests, trigonometry is all about triangles.
• To be more specific, it is more about right-angled triangles, the triangles with one angle equal to 90 degrees.
• It is a system that helps us to find missing angles and missing sides of a triangle.
• The word "trigono" generally means triangle and the word "metry" denotes measure.

3. Explain the terms sin cos and tan?

The terms sin, cos, and tan can be defined by the following table -

 NAME ABBREVIATION RELATIONSHIP Sine Sin Sin (θ)= Opposite/Hypotenuse Cosine Cos Cos (θ)= Adjacent/Hypotenuse Tangent Tan Tan (θ)= Opposite/Adjacent

4. Who is the father of trigonometry?

The first trigonometric table was apparently compiled by Hipparchus in (180-125 BCE), who is now known as "the father of trigonometry”. He was the first to tabulate the corresponding values of arc and chord for a series of angles.

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