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Ответ дан
valenivan

Один катет 12 см. Пусть второй катет х, тогда гипотенуза х+8.

По т. Пифагора

х^2+12^2=(х+8)^2,

(х+8+х)(х+8-х)=144,

16(х+4)=144,

х+4=144:16=9,

х=5(см)-вторрй катет,

5+8=13(см)- гипотенуза.

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