Cara menyelesaikan bentuk satuan derajat menjadi radian

360° = 2π rad
180° = π rad

180°/π = π/180° = 1


° → rad
30° = 30° × π/180° = π/6 rad
60° = 60° × π/180° = π/3 rad
120° = 120° × π/180° = 2π/3 rad

rad → °
½π rad = ½π × 180°/π = 90°
¾π rad = ¾π × 180°/π = 270°
3π rad = 3π × 180°/π = 540°