Used only in a non-right triangle when you have a “pair”(an angle and opposite side)
Formula: sinA/a = sinB/b = sinC/c
Cross multiply to solve
You get two answers for inverse and you have to check to see if they work.
Ex 1. Angle A = 110 degrees, Angle C = 20 degrees, and side b = 25. Find Angle B, side a, and side c.
180-110-20 = 50 degrees Angle B = 50 degrees
Sin50/25 = sin110/a sin50/25 = sin20/c
asin50 = 25sin110 csin50 = 25sin20
a = 25sin110/sin50 c = 25sin20/sin50
Side a = 30.667m side c = 11.162m
No comments:
Post a Comment