Jawabanmu

2014-05-06T12:34:13+07:00
K = 22/7 x d
132 = 22/7 x d
132x7/22 = d
42 = d
r = 42 : 2 = 21
Luas lingkaran = 22/7 x 21 x 21
                      = 66 X 21 = 1386 cm²
                       
2014-05-06T12:34:45+07:00
Keliling lingakaran=phi*d
132 = phi*d 
132=22/7*d132*7=22.d924=22.d924/22=d42=d21=r
luas lingkaran = phi*r*r22/7*21*21=1386