It is a half left side triangle, nothing more, nothing less.
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A midsegment of a triangle is parallel to the side of the triangle, and it's length is half the length of that side
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.
A relevant notion triangle is a triangle where side a is the longest line of a the triangle, the side b is the second longest line from the top of the triangle down to the right side of the triangle. The last line is side c which is the shortest line from the top to the bottom left.
a half triangle
No. For it to be a right angle triangle, 42 + 72 = 82. However, the left side is odd and the right side is even and so cannot be equal; thus the triangle cannot be right angled.