A radio telescope has a parabolic surface as shown below.
http://learn.flvs.net/webdav/assessment_images/educator_precalc/v12/module08/0808_g4_q1.gif

If the telescope is 1 m deep and 12 m wide, how far is the focus from the vertex?

1 m

36 m

3 m

9 m

Question

A radio telescope has a parabolic surface as shown below. 
http://learn.flvs.net/webdav/assessment_images/educator_precalc/v12/module08/0808_g4_q1.gif
 

If the telescope is 1 m deep and 12 m wide, how far is the focus from the vertex?

 1 m

 36 m

 3 m

 9 m

anonymous · Answer

@montrealgurl  @thomaster  @Hero  @Preetha

thomaster · Answer

can't open the link

anonymous · Answer

well you really only need the  last part (If the telescope is 1 m deep and 12 m wide, how far is the focus from the vertex?) @thomaster

anonymous · Answer

nevermind