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90°=4x+18
x=90-18/4
x= 18
ABD= 18+28
ABD= 46°
semoga bermanfaat
4x + 18 = 90
4x = 72
x = 18
Besar sudut ABD
x + 28 = 18 + 28
= 46
Semoga membantu, sukses un bersama :)