B) A circle is shown with centre O.
The shaded area is a What
of the circle.

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Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex