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Pelurusnya berarti 180-40= 140°
Perbandingan A dan penyiku = 4 : 5
besar sudut penyiku yaitu A+ B = 90⁰
Jmlh perbandingan : 4 +5 = 9
maka :
sudut A = 4/9 x 90 = 40⁰
Pelurus = A+ B
180⁰ = 40⁰ + B
B⁰ = 180-40
B⁰ = 140⁰ (D)