Concentric circles

In the circle with diameter, 13 cm is constructed chord 1 cm long. Calculate the radius of a concentric circle that touches this chord.

Correct answer:

r =  6.4807 cm

Step-by-step explanation:

d=13 cm t=1 cm r1=d/2=13/2=213=6.5 cm  r12 = r2 + (t/2)2  r=r12(t/2)2=6.52(1/2)2=42=6.4807 cm

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