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[[image: drawings of angles annotated "210"]]

[[calculations]]

       210
       210
      ____
      2100
     420
     _____
2280/44100  (18
     22440
     _____
     21300
       520

2280/44100  (19342
      2280
     _____
     21300
     20520
     _____
     37800
     228

21300
20520
_____
 7800
 6840
_____
 9600
 9120
_____
 4800