The circumference of a circle can be found using the fortula C=2
Which is an equivalent equation solved for r?
r=CH
r= C(2)
or = 21

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?