Trigonometry

Pythagoras in 3D

The Trigonometric Ratios

Triangle Problems

Trigonometry in 3D

Applications to Real Life

Sine Rule (Ambiguous Case)

Applications of the Sine Rule

Applications of the Cosine Rule

Sine and Cosine Rule

Area of Non-Right Angled Triangles

Stage 4 - Stage 5

The Trigonometric Ratios

Interactive practice questions

Write down the ratio represented by $\cos\theta$cosθ.

A right-angled triangle labeled with vertices A, B, and C is shown. The angle at vertex A is labeled $\alpha$α. The angle at vertex B is labeled $\theta$θ. The angle at vertex C is a right angle as indicated by a small square. Opposite vertex C is side AB, which is the hypotenuse. Side BC is adjacent to angle $\theta$θ. Side BC is opposite angle $\alpha$α. Side AC is adjacent to angle $\alpha$α. Side AC is opposite angle $\theta$θ.

Easy

< 1min

Write down the ratio represented by $\tan\theta$tanθ.

Easy

< 1min

Write down the ratio represented by $\sin\theta$sinθ.

Easy

< 1min

Consider the following figure.

Easy

3min

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