Any two dimentional geometric figure has a measurable length. This measurement is called circumference. This is also called a plane figure. Examples of plane figures with measurable lengths are: triangle, square, circle, and rectangle.
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The Earth is NOT a geometric shape because the Earth is not bounded; meaning it does not have sides or measurable depth, height, or width.
A construction. A contruction is a geometric drawing of a figure usually made by a compass and a straightedge.
A triangle is a geometric figure that is made of three line segments. It is a closed figure and has three angles.