how to find the missing angles of a triangle

5:14

3:40

6:40

14:33

3:22

10:01

10:20

8:49

2:01

29:56

8:01

3:52

12:25

13:29

2:53

11:00

12:43

21:52

21:12

5:25

23:02

15:14

5:51

5:36

7:24

4:55

5:42

11:12

2:52

4:49

2:37

5:06

11:36

3:23

5:28

5:22

2:45

7:51

6:45

11:40

13:31

19:00

17:52

5:31

1:43

10:28

5:34

2:40

59:18

8:44

3:22

3:12

10:33

5:46

4:58

4:49

6:27

4:25

3:45

5:50