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The Sine Graph in Radians

Part of the Graphs of Trig Functions section of Coddy's Trigonometry journey. Lesson 3 of 49.

Most graphs of sine measure the angle in radians, another unit for angles. A half turn, 180°, is $\pi$ radians. The wave does not change, only the numbers under it: 90° is $\frac{\pi}{2}$ and 360° is $2\pi$ . So the sine wave has its top at π/2 and its bottom at 3π/2. It is 0 at 0, π, 2π and so on, and repeats every 2π.

$The sine wave on an axis counted in radians, from minus 2 pi to 2 pi$

Challenge

A wheel has radius 3 m. Your seat starts level with the hub and goes up. Draw your height against the angle, now measured in radians.

Then press Check.

Start the lesson to read it in the interactive player and track your progress.

All lessons in Graphs of Trig Functions

1From Circle to Wave

Ride a Ferris Wheel Unrolling the Sine GraphThe Sine Graph in RadiansCircle to Wave Recap

4Period

Period: One Wave Long Stretching the Wave Period in Degrees b Is Not the Period Period Recap

7Reading a Graph

The Equation of a Wave Sine or Cosine?From Peaks to a Wave All Four at Once Reading Recap

10Final Challenges

A Wave From Its Facts A Hidden Shift A Flipped Tangent Read the Whole Wave Giant Wheel: the Model Giant Wheel: the Height

2The Cosine Graph

The Cosine Graph Cosine Is a Shifted Sine Where Sine Meets Cosine Cosine Graph Recap

5Midline

The Midline From Highest and Lowest Reading the Midline Midline Recap

8The Tangent Graph

The Tangent Graph Asymptotes Stretching the Tangent Graphs of sec, csc and cot Tangent Recap

3Amplitude

Amplitude: How Tall Amplitude of a Cosine A Negative a Flips It Amplitude From a Graph Amplitude Recap

6Phase Shift

Phase Shift: Sliding Phase Shift in Degrees Factor Out b First Reading a Phase Shift Phase Shift Recap

9Modelling with Waves

A Ferris Wheel Model Daylight Over a Year Tides Using a Model A Spring's Bounce Modelling Recap