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Summary Trigonometry Notes (with calculations)
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  • Trigonometry
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The document contains notes that provide a concise overview of trigonometry at the 9th grade level. It covers key concepts such as trigonometric ratios, the Pythagorean theorem and inverse trigonometric functions. The notes include mathematical calculations and examples to help illustrate these con...

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Document information

  • March 3, 2023
  • 2
  • 2022/2023
  • Summary

Subjects

  • trigonometry
  • geometry
  • 9th
  • 9th grade
  • maths
  • pythagorean theorem
  • trigonometric ratios
  • inverse trigonometric functions

Written for

  • Secondary school
  • Trigonometry
  • 3
All documents for this subject (6)

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darshagarwal

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Trigonometry Notes
1. Trigonometric ratios:



The three basic trigonometric ratios are sine (sin), cosine (cos), and tangent (tan). They are defined as
follows:



sin θ = opposite/hypotenuse
cos θ = adjacent/hypotenuse
tan θ = opposite/adjacent

Here, θ represents the measure of an angle in a right triangle, and opposite, adjacent, and hypotenuse refer

to the lengths of the sides of the triangle.


For example, consider a right triangle with an angle θ, an opposite side of length 3, an adjacent side of

length 4, and a hypotenuse of length 5. Then, we can calculate the sine, cosine, and tangent of θ as

follows:


sin θ = opposite/hypotenuse = ⅗
cos θ = adjacent/hypotenuse = ⅘
tan θ = opposite/adjacent = ¾




2. Pythagorean theorem:



The Pythagorean theorem states that in a right triangle, the square of the hypotenuse is equal to the sum of
the squares of the other two sides. That is:



c² = a² + b²


Here, c represents the length of the hypotenuse, and a and b represent the lengths of the other two sides.

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