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2014-05-21T17:11:48+07:00
Luas = π × r²
        = 3,14 × 5²
        = 3.14 × 25
        = 78,5 cm²
2 4 2
2014-05-21T17:12:32+07:00
R=10:2=5
L=pi*rkuadrat
=3.14*25
=78.5
1 4 1