tolong pakai cara ya

4.
50 = XPQ + 25
XPQ = 50 - 25
XPQ = 25

SPQ = 180 - 25 = 155

5.
a = 180 - (72 + 40)
a = 180 - 112
a = 68

c = a
c = 68

b = 180 - (68 + 40)
b = 180 - 118
b = 72