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Reference.org
Conical spiral
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a conical spiral, also known as a conical helix, is a <a href="/facts/Space_curve/xBQ0pTBW">space curve</a> on a <a href="/facts/Right_circular_cone/2c9GIzYD">right circular cone</a>, whose <a href="/facts/Orthographic_projection/L3Cv9kYD">floor projection</a> is a <a href="/facts/Plane_spiral/4R331aba">plane spiral</a>. If the floor projection is a <a href="/facts/Logarithmic_spiral/4rwkxL7B">logarithmic spiral</a>, it is called <i><a href="/facts/Conchospiral/KsEIVjGu">conchospiral</a></i> (from <a href="/facts/Conch/Ie4rhJQx">conch</a>). </p>