Penjelasan dengan langkah-langkah:
= (360 - (110×2) ÷ 2
= (360 - 220) ÷ 2
= 140 ÷ 2
= 70° (a)
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Penjelasan dengan langkah-langkah:
= (360 - (110×2) ÷ 2
= (360 - 220) ÷ 2
= 140 ÷ 2
= 70° (a)