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- Introduction to Trigonometry

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Try reviewing these fundamentals first.

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Get Started Now- Lesson: 11:51
- Lesson: 21:12

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.Determine the length of the longest guy wire if the tower in the middle of the bridge is 45 yards high and the angle of elevation from where the guy wire is anchored to the top of the tower is $40^\circ.$
- 2.If the length of the guy wire is 40 metres and the angle of elevation from where the guy wire is anchored is $35^\circ$, how far from the base of the pole is the guy wired anchored?

21.

Introduction to Trigonometry

21.1

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

21.2

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

21.3

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

21.4

Combination of SohCahToa questions

21.5

Solving expressions using 45-45-90 special right triangles

21.6

Solving expressions using 30-60-90 special right triangles

21.7

Word problems relating ladder in trigonometry

21.8

Word problems relating guy wire in trigonometry

21.9

Other word problems relating angles in trigonometry

We have over 1620 practice questions in UK Year 12 Maths for you to master.

Get Started Now21.1

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

21.2

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

21.3

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

21.4

Combination of SohCahToa questions

21.5

Solving expressions using 45-45-90 special right triangles

21.6

Solving expressions using 30-60-90 special right triangles

21.7

Word problems relating ladder in trigonometry

21.8

Word problems relating guy wire in trigonometry

21.9

Other word problems relating angles in trigonometry