Pre-Calculus, 9th edition
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66
| PAGE: 641 | SET: Exercises | PROBLEM: 66 |
Please look in your text book for this problem Statement
The distance from vertex to focus is 
and depth is 
.
Set the vertex of the parabola is at 
and it opens up.
The general form of the parabola is 
, where 
is distance from vertex to focus.
Thus the value of 
and the points on the parabola are 
and 
.
Substitute 
and 
in .
Where 
is the diameter of the headlight.
Therefore, the diameter of the headlight is 
.
The diameter of the headlight is 
.
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