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K= pi.d
50,24= 3,14 d
d= 50,24 : 3,14
= 16
r= 8 cm
Luasnya,berarti
L= pi.r²
= 3,14 x 8 x 8
=200,96 cm²
r = 50,24 /(6,28) = 8
luas = phi r^2 = 3,14 . 64 = 200, 96 m2