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Verified answer
Sudut AEC = 180° - ( < ABC + < ADC )= 180° - ( 72° + 36° )
= 180° - 108°
= 72°
<ECD = 72°
<DEC
= 180° - 72° - 36°
= 72°
<AEC
= (360°-(2×72) / 2
= 216/2
= 108° (A)