This broad branch of geometry departs from Euclid's parallel postulate; curved-space examples help describe general relativity.

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Your new ahaNon-Euclidean Geometry

Non-Euclidean Geometry: Branch of geometry studying curved rather than flat surfaces. Source: Non-Euclidean geometry ↗

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27A horizontal x-axis and vertical y-axis locate points on this two-dimensional grid.RECALL
Coordinate Plane
The coordinate plane, named for René Descartes, locates points using a horizontal and vertical axis.
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01This three-sided polygon's interior angles total 180° in Euclidean geometry.RECALL
Triangle
In Euclidean plane geometry, a triangle's interior angles add up to 180 degrees.
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02This plane curve consists of all points at a fixed positive distance from one centre.RECALL
Circle
A circle's edge stays perfectly equidistant from its center, with no straight sides or corners.
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