tolong bantu jawab ya !!!(yg bisa aja dan pake caranya ya!!)mksh

42 a
CBA = 65 (sehadap dg DEB)
DBE = 180 - (65+45) = 180 - 110 = 70
DBC = 180 - (65+70) = 180 - 135 = 45

42 b
EBC = EBD + DBC = 70 + 45 = 115

44 a
AB = AC, jadi segitiga ABC merupakan segitiga sama kaki.
ABC = 180 - 110 = 70
ABC = ACB = 70

44 b
BAC = 180 - (70+70) = 180 - 140 = 40