Mathematics Education Trigonometry lesson 4 – Sine rule By Magic Monk on Thursday, October 4, 2018 In this lesson you learn the proof of sine rule, and how to use it to find unknown sides / angles in a non-right angled triangle, when at least 1 pair of opposite sides/angles are given. education math mathematics steemiteducation steempress Previous Post Next Post Related Posts Mathematics Education Vector applications question – Elastic collision, momentum, and kinetic energy Mathematics Education Vectors lesson 21 – Basic vector operations in Geogebra Mathematics Education Vectors lesson 20 – drawing vectors in Geogebra