Rumus : AB=BC=CD=DA
∆ABC = ∆ADC < 90°
∆BAD = ∆BCD > 90°
∆ABC = 30°
=90-30=60
=90-60= 30° ✓
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Rumus : AB=BC=CD=DA
∆ABC = ∆ADC < 90°
∆BAD = ∆BCD > 90°
∆ABC = 30°
=90-30=60
=90-60= 30° ✓