Mathematical objects such as points and lines are coplanar if the lie in the same plane. In manipulative 1, lines A and B are coplanar with each other and with point C. Point D and line E are not coplanar with A, B, and C. Objects that are not in the same plane are called non-coplanar.
The grey parallelogram in manipulative 1 represents a portion of a plane. Click on the yellow points in manipulative 1 and drag them to change the figure. The yellow point labeled 'rotate' rotates the plane.
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