After the side of a cylinder is expanded, a square with side length of 12.56 cm is obtained. What are the surface area and volume of the original cylinder? The perimeter of the bottom surface of a cone-shaped grain pile is 9.42 meters and the height is 2.7 meters. If it is installed in a cone-shaped beam with a bottom radius of 1 meter, how high can it be piled?

After the side of a cylinder is expanded, a square with side length of 12.56 cm is obtained. What are the surface area and volume of the original cylinder? The perimeter of the bottom surface of a cone-shaped grain pile is 9.42 meters and the height is 2.7 meters. If it is installed in a cone-shaped beam with a bottom radius of 1 meter, how high can it be piled?

After the side of the cylinder is expanded, a square is obtained. Then, the circumference and height of the bottom surface of the cylinder are equal, which are 12.56 cm. Radius: 12.56 △ 2 △ 3.14 = 2 (CM). Surface area: 12.56 × 12.56 + 2 × 3.14 × 2 × 2 = 157.7536 + 25.12 = 182.8736 (CM). Volume: 3.14 × 2 × 2 × 12.56 = 157

After the side of a cylinder is expanded along the height, it is a square 12.56 cm long. What is the surface area of the cylinder in square centimeters?
It's the total length of a square, not the side length

12.56/3.14/2 = 2 cm (bottom radius)
3.14 * 2 * 2 = 12.56 square centimeter (bottom area)
12.56 * 12.56 = 157.7536 square centimeter (side area)
12.56 * 2 + 157.7536 = 182.8736 square centimeter (surface area)

Expand the side of a cylinder to get a square. Given that the circumference of the bottom of the cylinder is 12.56 cm, find the surface area of the cylinder

Side area: 12.56 × 12.56 = 157.7536 (cm2)
Radius: 12.56 △ 3.14 △ 2 = 2 (CM)
Two bottom areas: 3.14 × 2 & sup2; × 2 = 25.12 (cm2)
Surface area: 25.12 + 157.7536 = 182.8736 (cm2)