tolong dibantu no.4 paling atas

a. <PSQ = 180*- (35*+30*+40*)
= 180* - 105* = 75*

b. <PRQ = 180* - (30*+40*+56*)
= 180* - 126* = 54*

c. <QTR = 180* - (56*+54*)
= 180* - 110* = 70*

catatan: * artinya derajat

a. 75
b. 54
c. 70

semoga membantu