Minimum three noncollinear points are required to form a plane.
\Observe the figure; consider any three noncollinear points of the figure to name the plane. Total five planes (four side planes and one base plane) are shown in the figure and they are:
\1. Plane ABC
\2. Plane BCE
\3. Plane ADE
\4. Plane CDE
\5. Plane ABE
\Five planes are there in the figure.