Tolong dibantu yaa.. Sekalian pakai caranyaa

∠AOB = 45

Luas lingkaran = 616 cm²
πr² = 616
22/7 x r² = 616
22r² = 4312
r² = 4312/22
r = √196
r = 14 cm

Keliling lingkaran
= 2πr
= 2 x 22/7 x 14
= 44 x 2
= 88 cm

Panjang busur AB
= ∠AOB/360 x K.lingkaran
= 45/360 x 88
= 1/8 x 88
= 88/8
= 11 cm