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A circle is inscribed in a triangle ABC with right angle at A. The length of the two sides containing the right angle are

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A circle is inscribed in a triangle ABC with right angle at A. The length of the two sides containing the right angle are 6 cm and 8 cm respectively. The radius of the circle is: 

(A) 2 cm 

(B) 6 cm

(C) 8 cm 

(D) 10 cm

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Correct option is (A) 2 cm

8 - r = 4 + r 

2r + 4 

r = 2 cm

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