Envelopes - Hutchinson encyclopedia article about Envelopes Printer Friendly
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envelope
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envelope

In geometry, a curve that touches all the members of a family of lines or curves. For example, a family of three equal circles all touching each other and forming a triangular pattern (like a clover leaf) has two envelopes: a small circle that fits in the space in the middle, and a large circle that encompasses all three circles.
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