turn it from the middle
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it will turn on a pivot point of the triangle.
rotate it 90 degrees
If it's an *equilateral* triangle, a triangle. Check out quadrilaterals (squares, rectangles), then *equilateral* pentagons, hexagons, etc. Generally, an equilateral polygon needs only rotate (360/number of sides) degrees to coincide.
translate, rotate, reflect, & dilate
The point where the three medians of a triangle intersect is called the centroid of the triangle.