This Research aimed to : 1) Create interactive mathematics learning CDs
based on the discovery learning on round face three dimensional object for junior
high school class IX. 2) know the response of teachers and students with the
learning CD. This research uses a modified 4D development model, define, design,
and develop. The experiment was conducted in Muhammadiyah Junior High School
of Purwojati with research subject that is student of class IX. From the research,
the developed learning CD was valid by getting the average value from the
validator that is 4.5. From teacher response get average 4,46 and from student
response is 81,6%. The learning CD get positive responses from teachers and
students