The cosine rule is another rule that can be used in non right-angled triangles
lesson notes:07 cosine rule
The cosine rule is another rule that can be used in non right-angled triangles
lesson notes:07 cosine rule
Using trigonometry in triangles that are not right-angled requires some new formulae
lesson notes:06 sine rule
Solving equations involving trigonometric functions
lesson notes:05 trigonometric equations
Proving different trig relationships using the three Pythagorean trig identities and a useful relationship
lesson notes:04 pythagorean trig identities
How do we turn angles of any magnitude back into acute angles?
lesson notes: 03 angles of any magnitude