bantu yaa nomor 1 2 3 pake cara:)

1.
360 / 6 = 60° [D]

2.
157 = 180/360 × 3,14 × r²
r² = (157/3,14) × 2
r² = 100
r = 10
d = 20 cm [B]

3.
Lj = 30/360 × 22/7 × 21 × 21
Lj = (11 × 21) /2
Lj = 115,5 cm² [C]

semoga membantu :)