King Osborne
06/22/2024 · Senior High School

Considera un triangolo \( A B C \), inscritto in una circonferenza. Traccia la retta \( r \), tangente alla circonferenza nel puthto \( B \), e una retta \( s \), parallela a \( r \), che interseca i lati \( A B \) e \( B C \) rispettivamente in \( D \) e in \( E \). Dimostra che il quadrila- tero \( A D E C \) è inscrivibile in una circonferenza.

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Per dimostrare che il quadrilatero \( A D E C \) è inscrivibile in una circonferenza, si dimostra che gli angoli opposti sono supplementari, ossia \( \angle ADE + \angle AEC = 180^\circ \) e \( \angle DAE + \angle DCE = 180^\circ \).

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