So the volume = π * (5/π) 2 * 10 = 50/π cubic centimeter.

2. When the bottom is surrounded by 3 1.4cm, the bottom area is large.

At this time, the bottom radius =3 1.4/(2π)=5cm.

So the area of the two bottom circles = 4π * 25 = 3 14cm2.

3. No, it crawls on the surface of a cube, spreading the surface of the cube into a plane, so the spider's crawling route should be a straight line.

There are three routes, and the shortest one is required.