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- Introduction to Trigonometry

Still Confused?

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Get Started Now- Intro Lesson13:03
- Lesson: 12:53
- Lesson: 23:21
- Lesson: 3a2:57
- Lesson: 3b1:32
- Lesson: 3c1:09
- 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 calculatora)$\sin 60^\circ$b)$\sin-60^\circ$
- 2.Determine the angle to the nearest degreea)$\sin \theta =0.57$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)$\sin \theta = {5 \over 13}$

22.

Introduction to Trigonometry

22.1

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

22.2

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

22.3

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

22.4

Combination of SohCahToa questions

22.5

Solving expressions using 45-45-90 special right triangles

22.6

Solving expressions using 30-60-90 special right triangles

22.7

Word problems relating ladder in trigonometry

22.8

Word problems relating guy wire in trigonometry

22.9

Other word problems relating angles in trigonometry

We have over 1390 practice questions in Higher 1 Maths for you to master.

Get Started Now22.1

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

22.2

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

22.3

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

22.4

Combination of SohCahToa questions

22.5

Solving expressions using 45-45-90 special right triangles

22.6

Solving expressions using 30-60-90 special right triangles

22.7

Word problems relating ladder in trigonometry

22.8

Word problems relating guy wire in trigonometry

22.9

Other word problems relating angles in trigonometry