What are the sizes (dimensions) of the bases in major league baseball?

https://en.wikipedia.org/wiki/Baseball_field#Specifications

Home base shall be marked by a five sided slab of whitened rubber. It shall be a 17 inch square with two of the corners removed so that one edge is 17 inches long, two adjacent sides are 8 1/2 inches and the remaining two sides are 12 inches and set at an angle to make a point. It shall be set in the ground with the point at the intersection of the lines extending from home base to first base and to third {base;} with the 17 inch edge facing the pitcher's plate, and the two 12 inch edges coinciding with the first and third base lines. The top edges of home base shall be beveled and the base shall be fixed in the ground level with the ground surface.

First, second and third bases shall be marked by white canvas bags, securely attached to the ground as indicated in Diagram 2. The first and third base bags shall be entirely within the infield. The second base bag shall be centered on second base. The bags shall be 15 inches square, not less than three nor more than five inches thick, and filled with soft material.

Note that the given definition of home plate isn't violated if the plate is 12 feet high.