Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Two-dimensional shapes are flat figures that exist only in a plane (such as on paper or a computer screen) and have length and width dimensions.
Related terms
Polygon: A polygon is a closed two-dimensional shape formed by straight lines called sides. Examples include triangles, quadrilaterals, pentagons, etc.
Circle: A circle is a two-dimensional shape with all points equidistant from the center point. It has no straight sides or angles.
Triangle: A triangle is a three-sided polygon with angles that always add up to 180 degrees.