A person sprints around a circular track and stops after running 40 percent around the circumference of the track. If the total distance traveled was 80π meters, what is the diameter of the circular track?

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).

Point r divides in the ratio 1 : 5. if the coordinates of e and f are (4, 8) and (11, 4), respectively, what are the coordinates of r to two decimal places?