1. The radius of the bottom of the cylinder is 2cm, the height is 5cm, and the area of the side surface is (20π) cm2.

2. The radius of the cylinder bottom is 1 decimeter. After the side of the cylinder is unfolded, a square is obtained, and the height of the cylinder is (2π) decimeter.

If you want this area of cylinder, you need to know * (bottom radius) and (height).

Thank you for your adoption! You can ask if you need to explain.