Jawabanmu

2014-06-02T16:44:25+07:00
Luas = 1/4 x 22/7 x 28 x 28
       = 22 x 28
       = 616 cm²

jadi luasnya 616 cm²
2014-06-02T16:45:32+07:00
R =  \frac{1}{2} . d
r =  \frac{1}{2} . 28
r = 14 cm

L lingkaran = π . r . r
 \frac{22}{7} . 14 . 14
= 616 cm²