- Trigonometry
- Angles in Standard Positions
- Coterminal Angles
- Angle Conversion
- Origins of Trigonometry
- Trigonometric Ratios
- Solving a Right-Angle Trigonometry Question
- Pythagorean Theorem
- Inverse Trigonometric Functions
- Trigonometric Circle
- Sine and Cosine Law
- Simplifying Trigonometric Expressions
- Graphing Trigonometric Functions
- Proving Trigonometric Identities

The Pythagorean theorem is a formula relating to three sides of a right triangle. It was named after the ancient Greek thinker Pythagoras, but the origin of the discovery is of the subject of debate.

The theorem state that the sum of the squares of the two shorter sides of the right triangle are equal to the square of the longer side called the hypotenuse. \[a^2 + b^2 = c^2 \]

Keep in mind Pythagoras' Theorem only applies to right triangles (where one of the angles is \(90^{\circ}\))

Solve for \(x\).

**Solution:**

\[\begin{align} x^2 + 4^2 &= 5^2 \\ x^2 + 16 &= 25 \\ x^2 &= 9 \\ x &= \pm\sqrt{9}\quad negative\,distance\,rejected \\ x &= 3 \\ \end{align}\]

Designed by Matthew Cheung. This work is licensed under a Creative Commons Attribution 4.0 International License.

- Last Updated: Apr 11, 2023 5:52 PM
- URL: https://libraryguides.centennialcollege.ca/c.php?g=716824
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