Jawabanmu

2014-01-20T13:12:54+07:00
Karena sudutnya 90 derajat jadi 90/360 X pi X d=5.5
1/4 X 22/7 X d = 5,5
22/28 X d= 5,5
d=5,5 X 28/22
d=154/22=7 cm
2014-01-20T13:41:45+07:00