In RT △ ABC, angle c = 90 degrees, angle a = 50 degrees, ab = 5, find the length of BC and AC

In RT △ ABC, angle c = 90 degrees, angle a = 50 degrees, ab = 5, find the length of BC and AC

According to the sine theorem of triangle, we can get AB / sinc = BC / Sina = AC / SICB, that is 5 / sin90 ° = BC / sin50 ° = AC / sin40 ° sin90 ° = 1. So BC = 5sin50 ° AC = 5sin40 ° we can learn the sine theorem in senior two. If we haven't learned it, we can use the definition of sine and cosine