Euclidean geometry assumes a flat plane.
<span>So triangles for example add up to 180 degrees. </span>
<span>Non-Euclidean geometry is on curved surfaces. </span>
<span>So triangles on a sphere do not add up to 180 degrees.</span>
27 - 1.5x ≤ 36
54 - 3x ≤ 72
54 - 72 ≤3x
-18 ≤ 3x
-6 ≤ x
x ≥ -6
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