Question

Find two triangles for which A=51 degrees, a = 6.5 ft, and b = 7.9 ft

Answer 1

i would use law of sines here:
\[\frac{\sin B}{7.9} = \frac{\sin 51}{6.5}\]
B = 70.83 or 109.17

Answer 2

yay! that's what i got :)

Answer 3

I also found C = 58 degrees but in the book there also another answer to C' which = 20 degrees, I don't get how they got 20 degrees ^^!

Answer 4

I understand B' = 180 - 71 = 109 degrees tho :)

Answer 5

sum of angles is 180

C = 180 - 51 - 70.83 = 58

C = 180 - 51 - 109.17 = 20

Answer 6

ohhh i see