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The radius of a circle equals the diameter divided by two. 30/2 is 15, so your answer is 15 cm.
3.4 cm equals 34 mm which is greater than 30 mm
100 cm = 1 m⇒ 800 cm = 800 ÷ 100 m= 8 m800 cm equals 8 meters. Centi, in Latin, means an hundred, which is to say that a centimeter is one hundredthof a meter. 800 divided by 100 is 8.
26 cm.
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