Concentric circles

In the circle with diameter, 16 cm is constructed chord 8 cm long. Calculate the radius of a concentric circle that touches this chord.

Correct answer:

r =  6.9282 cm

Step-by-step explanation:

(16/2)2=r2+(8/2)2 r=(16/2)2(8/2)2=6.9282 cm

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