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- Introduction to Trigonometry

Still Confused?

Try reviewing these fundamentals first.

Still Confused?

Try reviewing these fundamentals first.

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Get Started Now- Lesson: 11:37
- Lesson: 21:32

Basic concepts: Use sine ratio to calculate angles and side (Sin = $\frac{o}{h}$ ), Use cosine ratio to calculate angles and side (Cos = $\frac{a}{h}$ ), Use tangent ratio to calculate angles and side (Tan = $\frac{o}{a}$ ), Combination of SohCahToa questions,

Related concepts: Ferris wheel trig problems, Tides and water depth trig problems, Spring (simple harmonic motion) trig problems,

- 1.A ladder is leaning against an outside wall of a building. If the angle of elevation at the base of the ladder to the wall is $65^\circ$ and the ladder is 14 feet long, how far up the wall does the ladder reach?
- 2.A 23 foot long piece of wood is leaning against the wall of a house. If the angle of elevation at the base of the wood to the wall is $75^\circ$, how far is the wood from the base of the wall?

11.

Introduction to Trigonometry

11.1

Use sine ratio to calculate angles and side (Sin = $\frac{o}{h}$ )

11.2

Use cosine ratio to calculate angles and side (Cos = $\frac{a}{h}$ )

11.3

Use tangent ratio to calculate angles and side (Tan = $\frac{o}{a}$ )

11.4

Combination of SohCahToa questions

11.5

Solving expressions using 45-45-90 special right triangles

11.6

Solving expressions using 30-60-90 special right triangles

11.7

Word problems relating ladder in trigonometry

11.8

Word problems relating guy wire in trigonometry

11.9

Other word problems relating angles in trigonometry

We have over 1470 practice questions in AU Year 9 Maths for you to master.

Get Started Now11.1

Use sine ratio to calculate angles and side (Sin = $\frac{o}{h}$ )

11.2

Use cosine ratio to calculate angles and side (Cos = $\frac{a}{h}$ )

11.3

Use tangent ratio to calculate angles and side (Tan = $\frac{o}{a}$ )

11.4

Combination of SohCahToa questions

11.5

Solving expressions using 45-45-90 special right triangles

11.6

Solving expressions using 30-60-90 special right triangles

11.7

Word problems relating ladder in trigonometry

11.8

Word problems relating guy wire in trigonometry

11.9

Other word problems relating angles in trigonometry