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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 NowStart now and get better maths marks!

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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)$\sin \theta = {5 \over 13}$

25.

Introduction to Trigonometry

25.1

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

25.2

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

25.3

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

25.4

Combination of SohCahToa questions

25.5

Solving expressions using 45-45-90 special right triangles

25.6

Solving expressions using 30-60-90 special right triangles

25.7

Word problems relating ladder in trigonometry

25.8

Word problems relating guy wire in trigonometry

25.9

Other word problems relating angles in trigonometry

We have plenty of practice questions in Transition Year Maths for you to master.

Get Started Now25.1

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

25.2

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

25.3

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

25.4

Combination of SohCahToa questions

25.5

Solving expressions using 45-45-90 special right triangles

25.6

Solving expressions using 30-60-90 special right triangles

25.7

Word problems relating ladder in trigonometry

25.8

Word problems relating guy wire in trigonometry

25.9

Other word problems relating angles in trigonometry