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Kelas : X (1 SMA)
Materi : Trigonometri
Kata Kunci : derajat, radian

Pembahasan :
Hubungan ukuran derajat dengan ukuran radian (rad).
1° = phi/180 rad
1 rad = 180 derajat
Mari kita lihat soal tersebut.
1. Mengubah derajat ke radian
a. 30° = 30 x π/180 = π/6 rad
b. 45° = 45 x π/180 = π/4 rad
c. 150° = 150 x π/180 = 5π/6 rad
d. 210° = 210 x π/180 = 7π/6 rad
e. 315° = 315 x π/180 = 7π/4 rad

2. Mengubah radian ke derajat
a. π/6 rad = π/6 x 180° = 30°
b. 4/3π rad = 4π/3 x 180° = 240°
c. 7/6π rad = 7π/6x 180° = 210°
d. 5/12π rad = 5π/12 x 180° = 75°
e. 7/4π rad = 7π/4 x 180° = 315°
π=1
semoga bermanfaat