Base is always the number on the bottom. Height is always the line in the middle of the triangle unless the triangle is a right angle (90 degree triangle) and if it is, the number on the side is the height. Here's a picture of it:
The characteristic of the repeating shapes in a tessellation is that shapes cannot have spaces between them.
<h3>What is tessellation ?</h3>
When we talk about tessellation, our minds go to a situation in which many shapes especially polygons are packed together without spaces between them.
Thus, the characteristic of the repeating shapes in a tessellation is that shapes cannot have spaces between them.
Learn more about tessellation: brainly.com/question/3294818
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