The length of a diagonal of a square inscribed in a circle with radius $10\, cm$ is $\ldots \ldots \ldots . cm$.
The length of a diagonal of a square inscribed in a circle with radius $10\, cm$ is $\ldots \ldots \ldots . cm$.
- A
$20$
- B
$10$
- C
$10 \sqrt{2}$
- D
$20 \sqrt{2}$
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