Points C , A , and D are located along the edge of a river and point $B$ is on the opposite edge. Use $\triangle BCA$ and $\triangle BDA$ to determine which of the following are possible widths of the river.

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What percent of the circle below is shaded?

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