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pq² = ab² +(r1-r2)²
26²=24² + (15-r2)²
(15-r2)² = 26² -24² =(26+24)(26-24)=100
15-r2=10.... r2=5
R = = √100 = 10
R = r1 - r2
10 = 15 - r2
r2 = 5