Determining Unknown Angles of a Non-Right Angled Triangle - GCSE & A Level
Dr Frost covers determining angles in a non-right angled triangle by use of sine and cosine rules. Suitable for GCSE Higher tier and A Level.
00:00 Intro
00:41 Using sine rule
03:27 Further example
04:30 Ambiguous case
07:33 Cosine rule
10:20 Further example
11:46 Unknown not opposite known angle
More non-right-angled trigonometry (unknown angles) practice: https://www.drfrost.org/explorer.php?...
#maths #trigonometry #gcse