43. For any circle with 2 secants drawn from P to the circle, as shown in the figure below, the lengths of the segments of the secants are determined by a(a + b) = c(c + d) .
In the figure below, A, B, D, and E are on the circle. Point B is on secant segment AC, and D is on secant segment CE. The lengths of AB, BC, and CD are given in meters. What is the length, in meters, of DE ?
Your Answer is
Correct Answer is B
Explanation
According to the formula, bring in the values of AB, BC, and CD respectively, and set the value of DE to be x, and solve the equation until the value of DE is 7. Choose B.