The use of Sine rule
Sine rule is used to work out the length of a side of a triangle or to work out an angle of a triangle.
However these rules arent required for right angled triangles.
To use the Sine Rule you must break the triangle into letters. All the sides are given a lower case letter. a, b, c.All the angles are given a upper case letter A, B, C.The same letters must be opposite to each other eg. a is the side opposite angle A. Sine Rule = a/SinA = b/Sinb = c/Sinc.
Using the sine rule
Using the triangle in the earlier slide we can work out side 'a' (the opposite to angle 'A').
a/SinA = c/SinC
a/Sin45 = 10/Sin60
a = 10/Sin60 x Sin45
a = 8.16 cm