What solid is formed when rotating a square about a horizontal or vertical axis through the center of the square?

The solid figure formed is a cylinder.

Step-by-step explanation:

Rotation is an example of transformation in which a given figure is rotated about a reference point (origin) or line (axis). This converts majorly a two dimensional figure into a three dimensional figure or shape.

When a square is rotated about an axis, either horizontal or vertical, it generates another shape called a cylinder. Therefore, a 2D figure(square)  generates a 3D (cylinder) shape due to rotation about an axis.

The cylinder would have circular surfaces with diameter which is the same as the length of the side of the initial square.

just sum

10 + 10 = 20

step-by-step explanation: