Cyclic quadrilaterals

저자:Matthew Kushner

A cyclic quadrilateral is a 4 sided figure inscribed in a circle. Each vertex lies on the circle. There are special angle relationships in this type of figure.

Move the points around. Don't let the line segments cross. Look at the green pair. Look at the red pair. The green pair of angles A and C have what relationship?

적용되는 모든 것을 선택하세요.

A
No relationships. The green angles are random degrees with no relationship between them.
B
The two green angles are always equal.
C
The two green angles always sum to 180 degrees no matter what.
D
The two green angles always have a difference of 90 degrees.

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