Misc. Triangles

If two right triangles have a leg and a hypotenuse equal to one another, they are congruent.
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If two triangles have two sides and the included angle equal to one another, they are congruent.
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If two triangles have three sides equal to one another, they are congruent.
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The length between the midpoints of two sides is half the distance of the third side
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The area and perimeter of the triangle formed by joining the midpoints of a triangle.
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The triangle formed by joining the intersection points of three circles with radii a, b, and c
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The triangle formed by three tangential circles with equal radii.
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