Yes they must be in the same units of measurements.
cube
A shape having the same dimensions of length, height and width is a cube. This can also be referred to as a square prism.
In two dimensions, are the same line.
Square or cube
No, it is not true.
cube
No. Not all MLB fields are the same dimensions. The base paths and the distance from home plate to the pitcher's mound are all the same but the actual "home run" measurements vary.
Isometric shapes means having the same dimension or measurements. A shape that is equal on all sides is isometric.
Same basic shape, except a cone has three dimensions, a triangle has two.
In any of the three spacial dimensions or a combination of same
Cube, equilateral pyramid, and sphere.