These measures of rotation between rays are expressed in degrees or radians.

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12These straight lines in the same Euclidean plane never intersect.RECALL
Parallel Lines
Parallel lines stay the same distance apart forever, never intersecting no matter how far extended.
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13This shape's six identical square faces are joined by twelve edges, all equal in length.RECALL
Cube
A cube's six identical square faces are joined by twelve edges, all equal in length.
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14Every point on this round surface is equally distant from its centre in three-dimensional space.RECALL
Sphere
A sphere encloses more volume per unit of surface area than any other three-dimensional shape.
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