jika luas juring OCD = 30 cm2, luas AOB adalah...?

Mapel : Matematika

Kelas : 8

Bab : Lingkaran


→a = 72°

→b = 120°

→COD = 30 cm²


Maka, Luas AOB :

= (b/a) x COD

= (120/72) x 30

= 50 cm² ✔

Lingkaran

<COD/<AOB = L OCD/L AOB
72/120 = 30/L AOB
3/5 = 30/L AOB
3 x L AOB = 30 x 5
3 x L AOB = 150
L AOB = 150/3
L AOB = 50 cm^2
Jadi luas AOB adalah 50 cm^2.

*semoga membantu. sukses selalu ^_^