Write the word or phrase that best completes each statement or answers the question.
-A spotlight has a parabolic cross section that is 6 ft wide at the opening and 2.5 ft deep at the vertex. Howfar from the vertex is the focus? Round answer to two decimal places.
A)0.90 ft
B)0.52 ft
C)0.21 ft
D)0.26 ft

Question

Quizplus · Accepted Answer

The focus of a parabola is located at a distance of p = (1/4a) from the vertex, where a is the distance from the vertex to the focus. In this case, a = 2.5 ft, so p = (1/4)(2.5 ft) = 0.625 ft.

Write the Word or Phrase That Best Completes Each Statement