tolong jawabbb!!! gawe sakiki!!

1). > keliling = Π × D = 3,14 × 50 = 157 cm
> jari jari = 50:2 = 25
> luas = Π × r² = 3,14 ×25² = 1962,5 cm
atau 19,625 m
>luas juring = 45°/360° × 1962,5 = 245,31 cm

2).> 30×2=60
> 3,14 × 60 = 188,4
> ~


maaf kalau salah