triangle/length

Question

 

side c=7, angle c=120, angle b=40 degrees

whats angle a? What's length of a and b?

Answer 1

Step 1:

measures angles are and and side .

Sine rule is .

Substitute and in the sine rule.

Find the length of angle .

Substitute in .

Length of angle is .

Find length of .

Find length of .

Substitute in the sine rule.

Solution:

Length of angle is .

Sides is lengths are