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Let aa n db represent the lengths of a ...

Let `aa n db` represent the lengths of a right triangles legs. If `d` is the diameter of a circle inscribed into the triangle, and `D` is the diameter of a circle circumscribed on the triangle, the `d+D` equals. (a)`a+b` (b) `2(a+b)` (c)`1/2(a+b)` (d) `sqrt(a^2+b^2)`

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