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Perbandingan sudut A : Pelurus = 3 : 7
jumlh sudut pelurus = 180
faktor pengali = x
maka :
sudut A + pelurus = 180
3x + 7x = 180
10x = 180
x = 180/10
x = 18⁰
jadi besar sudut A = 3 x 18⁰ = 54⁰
karena jumlh sudut penyiku = 90⁰
maka :
Sudut A + Penyiku = 90⁰
54⁰ + Penyiku = 90⁰
Penyiku = 90-54
Penyiku = 36⁰
Jadi penyiku sudut A = 36⁰