Find the diameter of the circle if its radius is: 6 dm 5 cm.

1dm = 10cm;
r = 6dm 5cm = (6 * 10) cm + 5cm = 60cm + 5cm = 65cm (led to one unit);
D = 2 * r (the diameter of the circle is equal to two of its radii);
D = 2 * 65cm = 130cm = (13 * 10) cm = 13dm.
Answer: With a radius of a circle equal to 6dm 5cm, its diameter will be 13dm.

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