bisa dibantu dengan penjelasan nya?
Nilai X
4x+15 + 8x+45 = 180°
12x+60 = 180°
12 x = 180°-60°
12x = 120°
x = 120°/12
x = 10°
Besar <AEC
<BAE + <DCE+<AEC = 360°
= 120° + 125°+<AEC = 360
= <AEC + 245 = 360°
= <AEC = 360° -245°
= <AEC = 115°
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