Jawabanmu

2014-01-31T11:30:51+07:00
A. keliling=22/7.2.28 = 176
   busur=45/360.176= 22

b. luas = 22/7.28.28 = 2464
   juring = 120/360.2464 = 821,34
2014-01-31T12:34:48+07:00
A. panjang busur = phi*d*</360
                         = 22/7*56*45/360
                         = 22
b. L juring = phi*r*r*</360
               = 22/7*28*28*120/360
               = 821,33