diketahui keliling suatu lingkaran 19 phi cm.berapa luas lingkaran tersebut??

K = 2πr
19 π = 2πr
19 = 2 r
19/2 = r
9,5 = r

Luas = π r²
= 3,14 x 9,5²
= 3,14 x 90,25
= 283,385 cm²

Good luck ❤