Use the following information to answer question 54-56.
The radio signal from the transmitter site of radio station WGGW can be received only within a radius of 52 miles in all directions from the transmitter site. A map of the region of coverage of the radio signal is shown below in the standard (x, y) coordinate plane, with the transmitter site at the origin and 1 coordinate unit representing 1 mile.
55. Which of the following is an equation of the circle shown on the map?
Your Answer is
Correct Answer is E
Explanation
The analytical formula of a circle is the square of the difference between x and the abscissa of the origin plus the square of the difference between y and the ordinate of the origin equals the square of the radius. The analytical formula of a circle with the origin as the center is x square plus y square is equal to the radius square, that is, x2+y2=522. Choose E.