tolong jawapin semua dong, aku kesulitan bgt sama math... aku gak ngerti sama sekali

foto satunya belum, maaf no 4 gak bisa

1. a.15,3° = 15,3 x π/180° (phinya tidak usah diganti 3,14)
= 153π/1800 (bagi 9) = 17π/200
b. 60° = 60π/180 (bagi 60) = π/3
c. 30° = 30π/180 (bagi 30) = π/6
d. 42° = 42π/180 (bagi 6) = 7π/30

2. a. 2/3π rad = 2π/3 x 180°/π = 360°/3 = 120°
b. 1/2π rad = π/2 x 180°/π = 90°
c. 1/6π rad = π/6 x 180°/π = 30°
d. 2/6π rad = π/3 rad = π/3 x 180°/π = 60°
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