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r² = 1256/3,14
r² = 400
r = √400
= 20 cm
Diameter = 20 × 2 = 40 cm
3,14×r²=1256
r²=1256 ÷ 3,14
r²=400
r=√400
r=20 cm
d=2r=2×20= 40 cm