ocr: Proprties of Triangles All Triangles A+B+C=180° a2-b2+c2-: 2bc cOS A (Law of Cosines) a b C sinA sin B sinC (Law of: Sines) d a-b tan 1/2 (A-B) (Law of Tangents) OA a+b tan 1/2 (A+B) B C. a=bcosC+ccos B, b=CCOSA +acosC, c=acos B + bcos A Area = Vs(s-a)(s-b)(s-c) where s= 1/2 (a+b+c) sinA-2.Area sinB-2.Area sinC-2.Area ab bc ca sin 2 == (s-b)(s-c) cOS 2 A - s(s-a) tan A =l (s-b)(s-c) bc bc 2 s(s-a) Right Angle Triangles B=90° Co A+B+C=180 - b a sinA=s b2=82+c2 COSA-C, tanA=2, CSCA-D, SeCA-b, C cotA=C Bahicd Ao
