дан угол альфа между диагоналями развёртки боковой поверхности цилиндра и дана длина диагонали развёртки боковой поверхности b.Определи площадь полной поверхности цилиндра
The surface area of a cylinder can be calculated by using the formula SA = 2πrh + 2πr^2, where r is the radius of the base and h is the height of the cylinder. In this case, we have the angle between the two diagonals of the lateral surface, meaning that we can use trigonometric functions to find the radius and height of the cylinder. First, we will find the value of r using the formula r = b/(2sinα), where b is the length of the diagonal and α is the angle between the diagonals. Next, we can use the Pythagorean theorem to find the height of the cylinder, h = √(r^2 - b^2/4). Once we have the values for r and h, we can substitute them into the formula for surface area and find the total surface area of the cylinder.