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a°+b° = 90°
dit : Besar penyiku sudut a ?
penyelesaian:
180°-130° = 50 °
Besar penyiku : 90°- 50° = 40 °
ini bermakna :
180 - <a = 130
<a = 180 - 130
<a = 50
Maka penyiku <a = 90 - 50
= 40