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sudut POM = 180 - 55° = 125°
a. besar sudut OLM = 1/2 x 125° ...sudut keliling = 1/2 x sudut pusat
= 62,5°
b. bsar sudut LKM = 1/2 x 55° ...sudut keliling = 1/2 x sudut pusat
= 27,5°
c. bsr sudut LMK = 180° - 55° - 62,5°
= 62,5°