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- Introduction to Trigonometry

Still Confused?

Try reviewing these fundamentals first.

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Try reviewing these fundamentals first.

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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 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.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.Polar Company has designed an ice block in the shape of a cube. The volume of the cube is 15,625 $cm^3.$ Which of the following dimensions is the smallest opening of an ice dispenser that will accommodate length AB?

45cm wide

25.

Introduction to Trigonometry

25.1

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

25.2

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

25.3

Use tangent ratio to calculate angles and side (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 over 1340 practice questions in Secondary 4 Maths for you to master.

Get Started Now25.1

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

25.2

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

25.3

Use tangent ratio to calculate angles and side (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