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tigaan phytagoras = 12, 16 ,20cm
R= 14cm-12cm = 2cm
16^2 = 20^2 - (14-r2)^2
(14-r2)^2 = 20^2 - 16^2
(14-r2)^2 = 400 - 256
(14-r2)^2 = 144
(14-r2)^2 = 12^2
14-r2 = 12
-r2 = 12 - 14
-r2 = - 2
r2 = 2cm
semoga membantu:)