Study notes
Trigonometry, Bearings & 3D
Sine rule, cosine rule, and the area formula for non-right-angled triangles, three-figure bearings, and 3D problems solved by finding the right 2D triangle inside a solid.
What this topic covers
- Right-angled trig is not enough for every triangle
- The sine rule links a side to its opposite angle
- The cosine rule links all three sides to one angle
- Area of a triangle without a right angle
- A three-figure bearing is measured clockwise from North
- 3D problems: pick the right 2D triangle first
Read the full Trigonometry, Bearings & 3D notes, free
Sign up free (100% free, no credit card) to unlock the full study notes, worked examples and mind map, and save your child's progress across devices.
Already have an account? Sign in