Study guide
IP EMaths Notes (Upper Sec, Year 3-4): 10) Trigonometric Applications
In one line
Apply sine and cosine rules, bearings, and area formulas to non-right-angled triangles and navigation tasks.
Last updated 30 Nov 2025
Reviewed by
Marcus Pang·Managing Director (Maths)
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- Start Here
- Formula summary
- Worked example - Cosine rule for an unknown side
- Worked example - Sine rule to find an angle
Q: What does IP EMaths Notes (Upper Sec, Year 3-4): 10) Trigonometric Applications cover?
A: Apply sine and cosine rules, bearings, and area formulas to non-right-angled triangles and navigation tasks.
Start Here
| Read time | What to take away |
| 1 second | When a triangle is not right-angled, use sine rule, cosine rule, or area formula. |
| 10 seconds | Sketch first. Use cosine rule for two sides with the included angle, sine rule for matched side-angle pairs, and bearing differences to find the angle between paths. |
| 100 seconds | Follow the side, angle, and bearing examples to practise a clean decision process: draw the triangle, name the known values, choose the formula, then check whether any second angle is possible. |
Extend beyond right triangles with the sine rule, cosine rule, and
