A triangle has the sides 20 cm and angles 15 degrees and 125 degrees.

1. measure of the other angle? is it 40?
2. measure of other sides? are they 6.3 and 15.7?

Question

A triangle has the sides 20 cm and angles 15 degrees and 125 degrees.

1. measure of the other angle? is it 40?
2. measure of other sides? are they 6.3 and 15.7?

anonymous · Answer

I used the law of sines.

mertsj · Answer

Can't tell unless we know the relationship between the given side and the angles.

anonymous · Answer

In triangle ABC (angles), A is unknown, C is 125, and B is 15. The side length c (across from angle C is 20

anonymous · Answer

i got approximately 6.3 for side b

mertsj · Answer

$$\frac{\sin125}{20}=\frac{\sin15}{b}, b=6.3$$

anonymous · Answer

okay thats what I did, is angle A forty and side a 15.6?

anonymous · Answer

approx 15.7 for side c

mertsj · Answer

$$\frac{\sin125}{20}=\frac{\sin40}{a}, a=15.7$$

anonymous · Answer

okay thank you! and if i use herons formula to find the area, is it 40.6?

anonymous · Answer

yes, a, my mistake