tolong jawab no 31- 32 beserta caranya

32.
Keliling lingkaran = 2πr
18,84 = 2 x 3,14 r
r = 18,84/6,28
r = 3 cm

Luas lingkaran = πr²
= 3,14 x 3²
= 3,14 x 9
= 28,26 cm²