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There are 3 lines of symmetry.

The Line of Symmetry is a line that can split a shape or object directly in half, leaving 2 identical sides. The 1st line of symmetry would be through the center of the middle-most triangle, the 2nd would be through the left corner of the middle-most triangle, and the final line of symmetry would be through the right corner of the middle-most triangle.

Here is an image showing the 3 Lines of Symmetry (the 3 colored lines).

I hope this helps!

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18

step-by-step explanation:

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