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lalu pelurusnya berarti 1/4x°
sifat sudut yg saling berpelurus:
jumlah sudutnya 90°
jadi=>
x°+(1/4)x°=90°
pake penjumlahan pecahan
(5/4)x°=90°
4.((5/4)x°)=4.(90°) (menghilangkan penyebut 4)
5x°=360°
x°= (360/5)°
x°=72°
semoga bs dimengerti
1/4 sudut pelurus =1/4 × 180° = 45°
maaf klo salah