Pliss ini gimanaa caranyaa

Lingkaran

No. 12
<AOB : <BOC = AB : BC
60° : 150° = 12 : BC
2 : 5 = 12 : BC
2BC = 12 x 5
2BC = 60
BC = 60/2
BC = 30 cm (C).

No. 13
Keliling lingkaran = π x d
88 = 22/7 x d
d = 88 x 7/22
d = 4 x 7
d = 28 cm
r = 28/2
r = 14 cm

L POQ = <POQ/360° x L lingkaran
= 108/360 x π x r x r
= 3/10 x 22/7 x 14 x 14
= 3/5 x 11 x 2 x 14
= 924/5
= 184,8 cm^2 (A).

*semoga membantu. sukses selalu ^_^