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How would I find lengths of all sides of right angled triangle with only knowing the inner circumference to be 5cm and outer to be 15cm. I only managed to find hypotenuse through the formula of R=c/2=>c=2R=30cm.

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For a right triangle, the circumradius lies on the hypotenuse. You can write a system of equations for the legs in terms of the hypotenuse and the inradius.

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