Half of a triangle is typically referred to as a "triangle" as well, since dividing it does not create a different geometric shape but simply results in two smaller triangles. However, in the context of specific divisions, such as when a triangle is split by a median, each resulting triangle can be described as a "sub-triangle." If a triangle is divided by its altitude, the halves can be called "right triangles," depending on the original triangle's dimensions.
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Half a square is called a rectangle or a triangle.
a half triangle
It is a half left side triangle, nothing more, nothing less.
Because a triangle is half of a rectangle. The area of a rectangle is length times width, the area of a triangle is half that.
It could be two trapezoids, or a triangle and a quadrilateral. It all depends on where the cut is made.