Question

Полина нарисовала картину на полотне квадратной формы со стороной 35 см. Она попросила брата сделать рамку для своего рисунка, собранную только по углам. Сколько брату потребуется реек длиной 50 см?

Answer 1

3 вроде..................

Answer 2

Answer in detail. Polina drew a picture on a square canvas with a side of 35 cm. She asked her brother to make a frame for her drawing, assembled only at the corners. How many planks of 50 cm long will the brother need?

To answer this question, we need to find the perimeter of the square canvas and the length of each corner of the frame. Then we can divide the perimeter by the length of each corner and round up to get the number of planks needed.

The perimeter of the square canvas is 35 x 4 = 140 cm. The length of each corner of the frame can be found by using the Pythagorean theorem: a^2 + b^2 = c^2, where a and b are the sides of the right triangle formed by the corner and c is the hypotenuse. Since the corner is a 45-degree angle, we can assume that a and b are equal. So we have a^2 + a^2 = c^2, or 2a^2 = c^2. Solving for c, we get c = sqrt(2) * a. Since a is half of the side of the square canvas, we have a = 35 / 2 = 17.5 cm. Therefore, c = sqrt(2) * 17.5 = 24.7 cm (rounded to one decimal place).

Now we can divide the perimeter by the length of each corner and round up to get the number of planks needed: 140 / 24.7 = 5.7, rounded up to 6. So the brother will need 6 planks of 50 cm long to make the frame for Polina's drawing.