ocr: Proprties ofiriangles All Triangles A+B+C=180° 82=b2+C4-2 2bccos A (Law of Cosines) a C sinA sinB sinC (Law of Sines) d lU a-b tan 1/2 (A-B) (Law of Tangents) A a+b tan 1/2 (A+B) B C a=bcosC+ccsB, b=CCOSA+aCsC, c=acos B +bcosA Area = Vs(s-a)(s-b)(s-c) where S= 1/2(a+b+c) sinA -2.Area sinB-2.Area ca sinC-2.Area ab bc A - /(s-b)(s-c) bc cOS 2 l s(s-a) bc tan 2- (s-b)(s-c) sin - l 2 s(s-a) Right Angle irangies B=90° Co A+B+C=1 180° - a - - - sinA=s b2=a2+c2 COSA=, tanA=a, CSCA=D, secA=D, cotA-C a Bahed Ao
