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6x = 180
x = 30
2. 2x + 90 + 3x = 180
5x = 180 - 90
x = 18
3. 4x + 2x + 40 + x = 180
7x = 180 - 40
x = 20
Untuk nilai masing-masing tinggal dikalikan. Misal untuk nomor 1. 5x = 5 x 30 = 150°. Hanya misalkan.