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b = ?
a + b = 90°
1/2 b + b = 90°
3/2 b = 90°
b = 90 : 3/2
b. = 180/3
b. = 60°
a = 1/2 b
a = 1/2 (60)
a = 30°
jadi, a=30° dan b=60° (kalau ditambah a + b = 30 + 60 = 90)
semoga bermanfaat