L.o. To decide which trig equation we should use
Trig L.o. To decide which trig equation we should use
Use cosine rule to find x
Use the sine rule to find x
Use cosine rule to find x
Use the sine rule to find x
Use cosine rule to find x
Use the sine rule to find x
• Right angles triangles always use Pythagoras and Soh Cah Toa • Sine rule is easier to use than cosine rule
2 sides and 1 angle Use cosine rule to find 3rd side Use sine rule to find the other 2 angles
Two angles and 1 side
Use sum of angles to find the other angle Use sine rule to find the other sides
3 sides
Use cosine rule to find 1 angle Use sine rule to find another
Use cosine rule to find x
Use the sine rule to find x
Use cosine rule to find x
Use the sine rule to find x
Use cosine rule to find x
Use the sine rule to find x
• Right angles triangles always use Pythagoras and Soh Cah Toa • Sine rule is easier to use than cosine rule
2 sides and 1 angle Use cosine rule to find 3rd side Use sine rule to find the other 2 angles
Two angles and 1 side
Use sum of angles to find the other angle Use sine rule to find the other sides
3 sides
Use cosine rule to find 1 angle Use sine rule to find another
