diametrul = 2×r
a) L cerc = 2×π×r=8π (m)
b) L cerc = 2×π×r= 1,(4)π = 14-1/9=13/9 π (m)
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diametrul = 2×r
a) L cerc = 2×π×r=8π (m)
b) L cerc = 2×π×r= 1,(4)π = 14-1/9=13/9 π (m)