Sure! Some examples of flags with geometric shapes are:

- Switzerland: It has a square flag with a white cross on a red background.
- Nepal: It has a unique flag with two triangles, one above the other. The upper triangle is white and the lower triangle is red, with a blue circle in the center.
- Poland: It has a rectangular flag with two equal-sized horizontal stripes, one white and one red.
- Japan: It has a rectangular flag with a red circle in the center, representing the sun.
- Indonesia: It has a rectangular flag with two equal-sized horizontal stripes, one red and one white.

These are just a few examples, but there are many more flags that use geometric shapes in their designs.
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