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Published byBertram Sparks Modified about 1 year ago

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Slicing at an Angle

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We have looked at slices made either parallel or perpendicular to: A face of a right rectangular prism or The base of a right rectangular pyramid Now we examine slices made at an angle, that are neither parallel nor perpendicular to any face of the prism or pyramid

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Which of the following could be a slice of a right rectangular prism?

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The square shaped slice can be made from a slice parallel to the base of a right rectangular prism

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Which of the following could be a slice of a cube?

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The square shaped slice can be made from a slice parallel to the base of a cube.

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Which of the following could be a slice of a right rectangular pyramid?

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The square shaped slice can be made from a slice parallel to the base of a right rectangular pyramid with a square base The triangle-shaped slice and isosceles trapezoid-shaped slices can be made from a slice made perpendicular to the base of a right rectangular pyramid.

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Example 1. Is it possible to make a triangular slice from this prism?

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Is it possible to make a triangular slice from this prism? Yes, it can be done by slicing off a corner of the right rectangular prism

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Exercise: How can you slice a right rectangular prism so that the slice is: 1a. an isosceles triangle? 1b. an equilateral triangle?

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How can you slice a right rectangular prism so that the slice is an isosceles triangle? I would use a ruler to measure two segments of equal length on two edges that meet at a common vertex. Then I would join these two endpoints with a third segment.

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How can you slice a right rectangular prism so that the slice is an equilateral triangle? I would use a ruler to measure three segments of equal length on three edges that meet at a common vertex.

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Example 2 Can a right rectangular prism be sliced at an angle so that the slice is quadrilateral?

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A right rectangular prism be sliced at an angle to produce a quadrilateral:

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Are the opposite sides of the quadrilateral parallel? Yes. Because the slice is made by one plane, the sides of the quadrilateral slice both lie in the same plane as each other and in opposite faces that are an equal distance apart. This means that the segments are parallel Since the opposite sides of the quadrilateral are parallel, the quadrilateral must be a parallelogram.

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Are there other ways to slice a right rectangular prism that result in other quadrilateral-shaped slices?

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A slice can be made to a right rectangular prism at an angle so that the resulting cross section is a trapezoid

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Slicing a plane through a right rectangular prism so that the slice meets the three faces of the prism, results in a slice the shape of a triangle If the slice meets four faces, the slice will be in the shape of a quadrilateral Is it possible to slice the prism in a way that the region formed is a pentagon? A hexagon? An octagon?

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It is possible to slice a prism with a plane so that the cross section is a pentagon. The slice would have to meet 5 of the 6 faces of the prism. It is possible for the slice to take the shape of a hexagon if the slice meets all six faces.

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It is not possible to create a slice in the shape of an octagon because a prism has six faces, and it is not possible for the shape of a slice to have more sides than the number of faces of the solid.

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Example 4: Can a pyramid be sliced at an angle so that the slice looks like a pentagon? Hint: Marking the vertices of the slice on the edges of the pyramid will facilitate the drawing of the slice.

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Can a pyramid be sliced at an angle so that slice is a hexagon? No – it is impossible to create a slice that is a hexagon because a right rectangular pyramid has five faces, and it is not possible for the shape of a slice to have more sides than the number of the faces of the solid.

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Draw a slice into a right rectangular prism to form a triangle and draw the slice:

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Draw a slice into a right rectangular prism to form a triangle:

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Draw a slice into a right rectangular prism to form a quadrilateral and draw the slice:

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Draw a slice into a right rectangular prism to form a pentagon and draw the slice:

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Draw a slice into a right rectangular prism to form a hexagon and draw the slice:

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