Question

Бабушке нужно обшить кружевами скатерть прямоугольной формы размером 120 см и 60 см. Хватит ли ей 4 м кружев. Даю 35 баллов.

Answer 1

Периметр скатерти: 120+120+60+60=360 см
кружев - 400 см.
Следовательно, хватит.

Answer 2

Calculating Lace Needed for Tablecloth

To calculate the amount of lace needed to cover a rectangular tablecloth, we can use the formula:

Lace needed = (Perimeter + Allowance) * Width

Where: - Perimeter = 2 * (Length + Width) - Allowance is the additional length for gathering or finishing the edges.

Given: - Length of the tablecloth = 120 cm - Width of the tablecloth = 60 cm - Lace available = 4 m

Let's calculate the lace needed.

Calculation

1. Perimeter: - Perimeter = 2 * (Length + Width) - Perimeter = 2 * (120 cm + 60 cm) - Perimeter = 2 * 180 cm - Perimeter = 360 cm

2. Allowance: - For this calculation, we'll assume an allowance of 10% of the perimeter for gathering and finishing. - Allowance = 0.1 * 360 cm - Allowance = 36 cm

3. Total Length of Lace Needed: - Total Length = (Perimeter + Allowance) * Width - Total Length = (360 cm + 36 cm) * 60 cm - Total Length = 396 cm * 60 cm - Total Length = 23760 cm - Total Length = 237.6 m

Conclusion

Based on the calculations, to cover a rectangular tablecloth with dimensions 120 cm x 60 cm, 4 meters of lace would not be sufficient. Approximately 237.6 meters of lace would be needed to cover the tablecloth with the given dimensions.