Question

Школьная хоккейная площадка длинной 50 м и шириной 20 м обнесена бортиком прямоугольной формы высотой 1 м. сколько краски потребуется для окраски бортика с внешней и внутренней сторон, если ход краски на 1 м(в квордате) состовляет 140 г и краска должна быть нанесена на 2 слоя. даю 17 балов((( ; )

Answer 1

9 кг 940 г нежен краски для покраски хоккейной площадки

Answer 2

Calculation of Paint Required for the Hockey Rink Border

To calculate the amount of paint required to paint the border of a school hockey rink, we need to determine the total surface area of the border. The border is rectangular in shape and has a length of 50 meters, a width of 20 meters, and a height of 1 meter.

The surface area of the border can be calculated by finding the sum of the areas of its four sides. Since the border has both an outer and inner side, we need to calculate the area for both sides separately.

Let's calculate the surface area of the outer side first:

1. Calculate the area of the longer sides: - Length: 50 meters - Height: 1 meter - Area of one longer side: 50 meters * 1 meter = 50 square meters - Area of both longer sides: 2 * 50 square meters = 100 square meters

2. Calculate the area of the shorter sides: - Length: 20 meters - Height: 1 meter - Area of one shorter side: 20 meters * 1 meter = 20 square meters - Area of both shorter sides: 2 * 20 square meters = 40 square meters

3. Calculate the total surface area of the outer side: - Total area of the longer sides: 100 square meters - Total area of the shorter sides: 40 square meters - Total surface area of the outer side: 100 square meters + 40 square meters = 140 square meters

Now, let's calculate the surface area of the inner side:

1. Calculate the area of the longer sides: - Length: 50 meters - Height: 1 meter - Area of one longer side: 50 meters * 1 meter = 50 square meters - Area of both longer sides: 2 * 50 square meters = 100 square meters

2. Calculate the area of the shorter sides: - Length: 20 meters - Height: 1 meter - Area of one shorter side: 20 meters * 1 meter = 20 square meters - Area of both shorter sides: 2 * 20 square meters = 40 square meters

3. Calculate the total surface area of the inner side: - Total area of the longer sides: 100 square meters - Total area of the shorter sides: 40 square meters - Total surface area of the inner side: 100 square meters + 40 square meters = 140 square meters

To find the total surface area of the border, we add the surface area of the outer side and the surface area of the inner side:

- Total surface area of the border: 140 square meters + 140 square meters = 280 square meters

Since the paint needs to be applied in two layers, we need to double the total surface area:

- Total surface area for two layers: 2 * 280 square meters = 560 square meters

According to the given information, the paint coverage per square meter is 140 grams. Therefore, the total amount of paint required can be calculated as follows:

- Total amount of paint required: 560 square meters * 140 grams = 78,400 grams

Please note that the above calculations are based on the given dimensions and assumptions.