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===Examples===
π = 3.14159265359 correct to 12 '''significant figures'''.
π = 3.142 correct to 4 '''significant figures'''.
The diameter of [[Earth]] = 12,742,000m correct to 5 '''significant figures'''.
The diameter of [[Earth]] = 12,700,000m correct to 3 '''significant figures'''.
The diameter of [[Earth]] = 10,000,000m correct to 1 '''significant figures'''.