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3 points determine and isometry
Author:
Steve Pelikan
We proved that knowing where an isometry maps the vertices of a non-degenerate triangle determines the transformation Here's you're given the image of a triangle and asked to determine the image of another point.
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이등변삼각형의 꼭짓점에서 밑변에 내린 수선의 발은 밑변의 중점이다.(Foot of Perpendicular at the base of the isosceles triangle is the center of the base.)
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