Why do the ocean tides follow a periodic pattern?

You can use trigonometry to graph the changes in high and low tides for a particular location. Along the coast, the tides are of particular interest. They are affected by the gravitational pull of both the moon and the sun. The high tides and low tides follow a periodic pattern that you can model with the sine function.

(Not my answer).

triangle abc is translated (just moved) so it's rigid transformation.

because shape is preserved, it's also isomatric transformation.

because it's rigid and somatric transformation, so size would also preserved.

therefore, follwing options are applicable:

1) it is rigid.

2) it is isomatric.

3) the size is preserved.