Jawabanmu

2014-06-04T10:28:55+07:00
Kel = 2 x pi x r
352 = 2 x 2/7 x r
r = 56

Luas = pi x r2 =9856
2014-06-04T10:29:48+07:00
352 : 22/7 = 352 x 7/22 = 112 ini baru diameter, jarijarinya 56
luas = π x r²= 22/7 x 56 x 56= 9856