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Jumlah sudut Δ = 180
⇒ 4 / 15 × 180 = 48°
⇒ 5/15 × 180 = 60°
⇒6 / 15 × 180 = 72°
jadi,besar sudut terbesar adl 72°
4a + 5a + 6a = 180
15a = 180
a = 12
Jadi, perbandingan sudutnya = 48, 60, 72. Yang pling besar sudutnya 72.