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perbandingn P : penyiku = 4 : 5
jumlh sudut penyiku = 90
maka :
Besar sudut P = 4/9 x 90 = 40⁰
jumlh sudut berpelurus = 180⁰
jdi :
sudut P + Pelurus = 180
40 + pelurus = 180⁰
Pelurus = 180 - 40
Pelurus = 140⁰ (A)
sudut P : penyiku sudut P = 4 : 5 (jumlah perbandingan = 9)
sudut P = x
sudut P =
pelurus sudut P =
=
=