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15x =180
x =12
48:60:72
Sudut kedua = 5 / ( 4 + 5 + 6 ) * 180⁰ = 5/15 * 180 = 60⁰
Sudut ketiga = 6 / ( 4 + 5 + 6 ) * 180⁰ = 6/15 * 180⁰ = 72⁰
b. Jenis segitiga itu adalah segitiga lancip.