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OpenStudy (anonymous):
How do you prove properties of angles for a quadrilateral inscribed in a circle?
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OpenStudy (qwertty123):
Theorem 1. If a convex quadrilateral is inscribed in a circle then the sum of its opposite angles is equal to 180°. Let us prove the first of the two equalities. Let BD be the diagonal of the quadrilateral ABCD. https://www.algebra.com/algebra/homework/word/geometry/The-property-of-the-angles-of-a-quadrilateral-inscribed-in-a-circle.lesson
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