(R-5)²+100²=R²解的:

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(R-5)²+100²=R²解的:(R-5)²+100²=R²解的:(R-5)²+100²=R²解的:r^2-

(R-5)²+100²=R²解的:
(R-5)²+100²=R²解的:

(R-5)²+100²=R²解的:
r^2 -10r + 25 +100^2 = r^2
10r = 25+100^2
r = 2.5+1000
r = 1002.5