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Cyclic quadrilaterals (= inscribed quadrilaterals) | plane geometry | elementary level
Episode 50.
Cyclic quadrilaterals (= inscribed quadrilaterals) | plane geometry | elementary level.
Branch of mathematics: plane geometry.
Difficulty level: elementary.
Definition. A quadrilateral is said to be cyclic (or inscribed) there exists a circle that passes through all 4 of its vertices.
Theorem. A quadrilateral is cyclic if and only if the sum of its opposite angles is equal to $180^{\circ}$.
Theorem. A quadrilateral is cyclic if and only if one of its angles is equal to the opposite external angle.
Theorem. A quadrilateral $ABCD$ is cyclic if and only if $\angle{ABD}=\angle{ACD}$.
Mathematics. Geometry. Plane geometry.
#Mathematics #Geometry #PlaneGeometry
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https://youtu.be/ovWv1XNb6Bo
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