A slice is made perpendicular to the base of a right rectangular prism, as shown in the figure.
What is the shape of the resulting two-dimensional cross- section?
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The cross-section is a .

Which formula finds the probability that a point on the grid below will be in the blue area? p(blue) = total number of squares number of blue squares number of blue squares p(blue) = total number of squares number of blue squares p(blue) = number of white squares