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Mengenal:
1 π radian = 180°
Maka,
3/4 π rad = 3/4 x 180°
= 3 x 45°
= 135°
Untuk 72 derajat:
Mode derajat ke radian:
a° = a/180 π rad
Didapat:
72° = 72/180 π rad (Dengan membalik persamaan)
= 2/5 π rad