a half triangle
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The circumradius of a right angled triangle would be equal to half the length of its hypotenuse.
Depending how you halve it can be a right angle triangle or an isosceles trapezoid
In some respects, yes. It is half of an equilateral triangle.
Triangle: Half the product of the longest side and the perpendicular distance from it to the apex. Trapezoid: Half the product of the sum of its bases and the height.
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