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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

The measure of angle 0 is 600 degrees

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?