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# Answer to Question #6512 in Analytic Geometry for mark joboy cantos

Question #6512
the axial cross section of a head light reflector is a parabola with the bulbs center as focus. find the depth of the headlight in centimeters, if the bulbs center is 2 centimeter. from the vertex and the radius of the head light is 10 centimeter
1
2012-02-16T07:17:02-0500
Let&#039;s find the equation of parabola in a form y&sup2; = 2px. The vertex coordinates are V(0,0). We know that focus has coordinates F(2=p/2,0), so p=2*2 = 4 and we got y&sup2; = 2*4*x = 8x. Let&#039;s find the depth of the headlight:
y = 10 (the radius of the headlight)
y&sup2; = 100 = 8*x ==&gt; x = 100/8 = 12.5cm.

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19.02.13, 06:38

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