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- Introduction to Trigonometry

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Get Started Now- Lesson: 12:07
- Lesson: 22:51
- Lesson: 33:54

Basic concepts: Use sine ratio to calculate angles and sides (Sin = $\frac{o}{h}$ ), Use cosine ratio to calculate angles and sides (Cos = $\frac{a}{h}$ ), Use tangent ratio to calculate angles and sides (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 bird is sitting in a 35 metre tall tree looking down at a worm on the ground. If the angle of depression from the bird to the ground is $55^\circ$, how far is the bird from the worm?
- 2.Standing on the balcony of an building A, the angle of elevation to the top of the building B across the street is $47^\circ$, and the angle of depression to the bottom of the building B is $58^\circ.$ If the buildings are 42 metres apart, find the height of the building B across the street.
- 3.If the volume of the cube below is 512 $cm^3$, what is the length of AB?

23.

Introduction to Trigonometry

23.1

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

23.2

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

23.3

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

23.4

Combination of SohCahToa questions

23.5

Solving expressions using 45-45-90 special right triangles

23.6

Solving expressions using 30-60-90 special right triangles

23.7

Word problems relating ladder in trigonometry

23.8

Word problems relating guy wire in trigonometry

23.9

Other word problems relating angles in trigonometry

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

Get Started Now23.1

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

23.2

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

23.3

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

23.4

Combination of SohCahToa questions

23.5

Solving expressions using 45-45-90 special right triangles

23.6

Solving expressions using 30-60-90 special right triangles

23.7

Word problems relating ladder in trigonometry

23.8

Word problems relating guy wire in trigonometry

23.9

Other word problems relating angles in trigonometry