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Patrulater inscriptibil: 19 5 , 4 5 , 3√ 29<br />
, 2√ 29<br />
.<br />
5 5<br />
Pentagon: 3, 4 5 , 3√ 29<br />
5<br />
, 4 5 , 2√ 29<br />
.<br />
5<br />
Trapez dreptunghic variabil:<br />
3+x, p 4x 2 +4x +5, 2 − x, 2; 0