tolongin dong ini caranya gimana

Kita cari diameternya dahulu :

k = π × d
314 = 3,14 × d
d = 314/3,14
d = 100

d = 100
r = 100 : 2 => 50

Lalu cari luasnya :

L = π × r²
L = 3,14 × 50 × 50
L = 314 × 5 × 5
L = 7.850 cm²


Jadi jawabannya = D

Kell= 314
Kell=Π.d
314= 3,14 . d
314/3,14 =d
100 = d
50 = r
Luas = Πr²
= 3,14 . 50. 50
= 78.500