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- Introduction to Trigonometry

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Get Started Now- Intro Lesson13:03
- Lesson: 13:13
- Lesson: 27:56
- Lesson: 3a4:42
- Lesson: 3b3:27
- Lesson: 3c2:40
- Lesson: 42:16
- Lesson: 4a1:52

One of the trigonometric ratios is sine ratio. It is the opposite side over the hypotenuse of right triangles. In other words, we can find the angles and sides of right-angled triangles by using the sine ratios.

- IntroductionWhat are sine, cosine and tangent?
- 1.Determine each sine ratio using a calculatora)$\sin 60^\circ$b)$\sin-60^\circ$
- 2.Determine the angle to the nearest degree using a calculatora)$\sin \theta =0.57$b)$\sin \theta = -0.65$
- 3.Determine the angles and sides using Sine ratioa)Find angle A and B:

b)Find the value of "x" using sine

c)Find the value of "x" using sine

- 4.Draw and label a right triangle to illustrate sine ratio, then calculate the angle.a)$\sin \theta = {5 \over 13}$

30.

Introduction to Trigonometry

30.1

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

30.2

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

30.3

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

30.4

Combination of SohCahToa questions

30.5

Solving expressions using 45-45-90 special right triangles

30.6

Solving expressions using 30-60-90 special right triangles

30.7

Word problems relating ladder in trigonometry

30.8

Word problems relating guy wire in trigonometry

30.9

Other word problems relating angles in trigonometry

We have over 1380 practice questions in NZ Year 11 Maths for you to master.

Get Started Now30.1

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

30.2

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

30.3

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

30.4

Combination of SohCahToa questions

30.5

Solving expressions using 45-45-90 special right triangles

30.6

Solving expressions using 30-60-90 special right triangles

30.7

Word problems relating ladder in trigonometry

30.8

Word problems relating guy wire in trigonometry

30.9

Other word problems relating angles in trigonometry