Question

Маша решила оклеить куб с ребром 4 см красной бумагой. Хватит ли ей красной бумаги прямоугольной формы,длина которого 2 дм 8 см, а ширина 50 мм ?

Answer 1

надо найти площадь куба значит это будет так 4 * 4 * 4 =64 см (4 кубических см ) дальше мы 2 дм 8 см переводим в 28см а 50 мм переводим в 5 см это будет 28 *5 = 140 квадратных см
Ответ: хватит

Answer 2

4*4*6=96см²- площадь поверхности куба ,5*28=140см²- площадь бумаги.140 больше чем 96 ,значит: хватит...140>96 - хватит

Answer 3

Calculation of the Required Red Paper

To determine if Masha has enough red paper to cover a cube with a 4 cm edge, we need to calculate the surface area of the cube and compare it to the area of the red paper she has.

The surface area of a cube can be calculated by multiplying the length of one side by itself and then multiplying the result by 6, since a cube has 6 equal sides.

In this case, the length of one side of the cube is 4 cm. Therefore, the surface area of the cube is:

Surface Area = 4 cm * 4 cm * 6 = 96 cm²

Now, let's calculate the area of the red paper Masha has. The dimensions of the rectangular red paper are given as 2 dm 8 cm (or 28 cm) in length and 50 mm (or 5 cm) in width.

Area of Red Paper = Length * Width = 28 cm * 5 cm = 140 cm²

To determine if Masha has enough red paper, we need to compare the surface area of the cube (96 cm²) with the area of the red paper (140 cm²).

Conclusion: Masha has enough red paper to cover the cube with a 4 cm edge, as the area of the red paper (140 cm²) is greater than the surface area of the cube (96 cm²).

Please note that the calculations were done using the metric system, converting millimeters to centimeters and decimeters to centimeters for consistency.