QUESTION 1
We can use the cosine rule to find the missing side length.
Recall that the cosine rule for a triangle with sides a,b,c and an included angle A is

Let the missing side length in the triangle with sides 6, 9 and the included angle of
be
units.
We then substitute the values into the cosine rule to obtain;





units to the nearest tenth.
QUESTION 2
We again use the cosine rule:

We substitute the given values to obtain;




to the nearest tenth
QUESTION 3
We again use the cosine rule :



to the nearest hundredth