tolong jawab nomer 13 dan pakai cara

13)
L arsir = L persegi - L O

#L persegi = s×s = 40 × 40 = 1600 cm²

r = 1/2 × d = 1/2 × 40 = 20
#L O = Πr² = 3,14 × 20 × 20 = 1256 cm²

L arsir = 1600 - 1256
L arsir = 344 cm²

semoga membantu dan bermanfaat