Monica designs and crafts bracelets using strips of silver, as shown below. Hiw long will the strio of silver need to be for monica to make a round bracelet with a diameter of 8 centimeters?

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?