Answer:
Radius = 13 / 2 = 6.5 cm
Diameter = 13 cm
Explanation
Radius
The straight line is drawn from the centre of a circle to a point on its circumference is called radius of the circle. The radius of a circle is half of its diameter.
Diameter
The chord that passes through the centre of a circle is called diameter of circle. Diameter is also called the largest chord of any circle. The length of diameter of a circle is two times it's radius.
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