One chord of a circle is given as 20.5 cm. Then the radius (r) of the circle must be:
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Correct answer: D
Explanation
The correct answer is option 4 i.e. r ≥ 10.25.
Given that
Length of the chord = 20.5cm
Since the diameter is the longest chord of the circle, 20.5 should be less than or equal to the diameter
Let the length of the radius be given as r
Diameter = r + r
Hence, r + r ≥ 20.5
⇒ r ≥ 10.25 cm