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The base of a cone can be

User Dolfa
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2 Answers

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A circle is the answer to your question
User Dheeresha
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The base of a cone is something circular, like a circle or an ellipse.
The rest of the options (square, triangle, and pentagon) are all based of pyramids, not cones. Cones have to have a circular base because otherwise they'd be pyramids.
User Peter Krnjevic
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