plis tolong jawab no 3 pakai cara ya

Lampion = rumus lp bola
4πr²
r = 1/2 diameter = ½. 8 = 4
1 bola = 4× 3,14 × 4²
= 200,96 cm²
24 lingkaran = 200,96 × 24 = 4823,04 cm²
Sedangkan luas karton = 75×75 = 5625 cm²
Sisa karton = 5625-4823,04 = 801,96 cm²