a parabolic tv antenna is 18 feet across and 8 feet deep if the receiver is placed at the focus how far is it from the vertex?

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- May 18th 2010, 04:48 PMddoparabolic tv antenna ( HELP!!! )
**a parabolic tv antenna is 18 feet across and 8 feet deep if the receiver is placed at the focus how far is it from the vertex?** - May 18th 2010, 05:46 PMskeeter