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(180 - A) = 19/7. (90 - A)
7.(180 - A) = 19. (90 - A)
1260 - 7A = 1710 - 19A
- 7A + 19A = 1710 - 1260.
12A = 450
A = 37,5
Jadi besar sudut A = 37,5.
Penyikiu A = 90 - 37,5 = 52,5
Pelurus A = 180 - 37,5 = 142,5
180-A = 1710/7 - 19/7A
1260 - 7A = 1710 - 19 A (dikalikan 7)
1260 - 1710 = -19 A + 7A
-450 = -12 A
A = 37.5
Penyiku 90 -37.5 = 52.5
Pelurus 180 -37.5 = 142.5