Missing angles

Missing angle lv.1

100

110+45+x=180

x=25

200

180=90+x+30

x=30

300

45 + x = 90

x=45

400

120 + x =180

60

500

x + 85 = 180

95

Missing angle lv.2

100

25+25+x=90

40

200

x + 100 + 30= 180

50

300

100 + 20 + x=180

60

400

True or False

20 +50 +70=180

False

500

40+50+ x =180

90

Missing angle lv.3

100

30+60= x

90

200

70 + x = 90

x=20

300

30+40+10=90

True or False

False

400

True or False

45+45=90

True

500

111+49+ x = 180

20