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Jadi 90 derajat itu = 2phi x 90/360
= 2phi x 1/4
= 1/2 phi radian
Kalau 270 derajat jadinya = 2phi x 3/4
= 3/2 phi radian
Maaf kalau salah ..
Jadi 90 derajat itu = 2phi x 90/360
= 2phi x 1/4
= 1/2 phi radian
Kalau 270 derajat jadinya = 2phi x 3/4
= 3/2 phi radian