How many cubic centimeters is a cake box? How many square meters of cardboard does it take to make a cake box? How many centimeters does the ribbon wrap take? The knot is 20 cm
Volume =3. 14×(30÷2)? ×15 = = 3.14× 225×15 =10597.5 cubic centimeters
Surface area = (30× 30+30×15+30×15) × 2 =
=（900+450+450）×2
= 1800×2
=3600 square centimeters
Use ribbon 30×4+ 15×4+20=200 cm.