(20 10? The figure shows three views of a space geometry, in which both the front view and the side view are circles with a radius of 1. This geometry is

This geometry is known to be a three-quarter sphere,

Its surface area includes 34 spheres and two semi-circular areas with the same radius as the spheres.

∫R = 1

So S=34? 4? π+2? 12? π=4π

So the answer is: 4π.