IV. b t c r k

sinB = - y

C = 90 -B, tangB = ->

b = a sinB, C = 9o°-B, « = 6 coséc B, C = 9 o°-B,

c = a cosB.

c = a cosB.

c = b cotB.

TRIANGLES REGTILIGNES OBLIQUANGLES

sinB

sin B = - sin A ,

sin A C=i8o°-A

sin G c = a-T—ri sin A

q g* sinBsinC

~~ a sin A

sinC

sraA cot|A,

i(B + C) = 9 o°-iA, tangi(B-C):

, sinA (6 + c)sin|A (*-QcosjA g = ±* csinA ^ihT»~ cosj(B-C) ~ sini(B-C)' & ~>* csinA -

tang | A = — £-