Quandaries
and Queries
Joy
Student
Secondary Level Questions
How do you solve this? Do you solve this triangle using the law of sines of the law of cosines? (ASA)
A=120DEG. B=40DEG c=35 cm
I keep getting different answers.
Hi Joy,
To use the law of cosines you need to know the lengths of two sides.
Since the sum of the angles in a triangle is 180 degrees you know that the measure of angle C is 20 degrees. Thus
a/sin(A) = c/sin(C)
so
a = c
sin(A)/sin(C) = 35
Now do the same to solve for b. I got b = 65.78 cm.
Penny