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jumlah sudut segitiga 180°
x° =180/9
=20°
sudut prtama = 2 x 20°
= 40°
sudut kedua = 3x20°
=60°
sudut ketiga =4x20°
=80°
jadi,sudut segitiganya yaitu 40°,60°,80°.maka digolongkan segitiga lancip
9x = 180
x = 20
2x = 2.20 = 40⁰
3x = 3.20 = 60⁰
4x = 4.20 = 80⁰
jaddi termsuk segitiga lancip