sudut DEI, sudut DFI, sudut DGI =
72° / 3 = 24°
sudut DOI = sudut DFI x 2
24° x 2 = 48°
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sudut DEI, sudut DFI, sudut DGI =
72° / 3 = 24°
sudut DOI = sudut DFI x 2
24° x 2 = 48°