Draw a line from the midpoint of each side of the triangle to opposite corner. All three lines should intersect at the center of the original triangle and six smaller triangles will be formed.
There are likely other solutions, but this is the easiest one.
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Most triangles don't have any lines of symmetry. An isosceles triangle has one. An equilateral triangle has three.
An equilateral triangle has 3 lines of symmetry whereas an isosceles triangle has 1 line of symmetry but normally no triangles have 2 lines of symmetry.
No such thing as a regular triangle. You need to be more accurate in your triangular description. Equilateral triangle is symmetric about three lines of symmetry. Isosceles triangle is symmetric one line of symmetry. Right-angled, and Scalene triangles have no lines of symmetry.
There are 3 triangles in a pentagon
You can make a square with 3 right angle triangles The smaller triangles will be halve the size of the larger triangle