Ответ:
1 і 3сторона =х
2 і 4сторона =х+8
х+х+х+8+х+8=56
4х+16=56
4х=40
х=10
10+8=18
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Ответ:
1 і 3сторона =х
2 і 4сторона =х+8
х+х+х+8+х+8=56
4х+16=56
4х=40
х=10
10+8=18