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If the square pyramid shown above is sliced by a plane that passes through the top vertex, which of the following best describes the cross-section of the pyramid?
obtuse triangle
isosceles triangle
rectangle
square
A square pyramid has a square base and four triangular faces that meet at a common point. The square pyramid below is sliced by a plane perpendicular to the base and passing through the top vertex.The cross-section created by the plane is an isosceles triangle. Therefore, the isosceles is the best choice.
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