A B C D b a h x c x FromtherighttriangleADCwededucex2h2b21andcosAx bxbcosA2FromtherighttriangleBDCwededucecx2h2a2a2c22cxx2h23Substitutingequations1and2into3wegeta2 ID: 332040
A B C D b a h x c x FromtherighttriangleADC wededucex2+h2=b2(1)andcosA=x b=)x=bcosA:(2)FromtherighttriangleBDC