Posted by **lindsey** on Tuesday, December 20, 2011 at 8:19pm.

The cross section of a television antenna dish is a parabola. A dish has a receiver that is located at the focus, 4 ft. above the vertex.

Find the equation. (which I did) -- x^2 = 8y

If the dish is 8 feet wide, how deep is it?

- trig -
**Damon**, Tuesday, December 20, 2011 at 8:28pm
so x = +/- 4 if 8 wide

what is y ?

16 = 8 y

y = 2

- trig -
**lindsey**, Tuesday, December 20, 2011 at 8:30pm
Wow. Do I just substitute x with 8, and then solve to get y=5?

- trig -
**Lindsey**, Tuesday, December 20, 2011 at 8:30pm
Oops nevermind, sorry.

- trig -
**Damon**, Tuesday, December 20, 2011 at 8:32pm
No, x is half the width.

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