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Cyclic Quadrilaterals

Circle Theorem: Opposite angles in a cyclic quadrilateral add up to 180°

  • This theorem explains that in a cyclic quadrilateral, if all four vertices lie on the circumference of a circle, then the angles opposite to each other will sum up to 180°.
  • A cyclic quadrilateral must have all its vertices on the circumference of a circle.

Cyclic Quadrilaterals | Mathematics for GCSE/IGCSE - Year 11

  • The cyclic quadrilateral theorem is exclusive to cyclic quadrilaterals and does not apply to other types of quadrilaterals within a circle.
    • For instance, a common scenario that does not involve a cyclic quadrilateral is depicted below:

Cyclic Quadrilaterals | Mathematics for GCSE/IGCSE - Year 11

  • When utilizing the cyclic quadrilateral theorem as a reason in an examination, it is essential to incorporate key vocabulary. 
    • In this context, opposite angles in a cyclic quadrilateral sum up to 180°. 
    • The term 'supplementary' denotes angles that add up to 180° and can also be utilized with specific reference to angles within a cyclic quadrilateral.
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FAQs on Cyclic Quadrilaterals - Mathematics for GCSE/IGCSE - Year 11

1. How can I identify a cyclic quadrilateral?
Ans. A cyclic quadrilateral is a quadrilateral where all four vertices lie on the circumference of a circle. To identify a cyclic quadrilateral, you can check if the sum of opposite angles is equal to 180 degrees.
2. What is the Cyclic Quadrilateral Theorem?
Ans. The Cyclic Quadrilateral Theorem states that the opposite angles of a cyclic quadrilateral are supplementary, meaning they add up to 180 degrees.
3. Can a quadrilateral be cyclic if all its sides are equal?
Ans. No, a quadrilateral with all sides equal is a rhombus, and not all rhombuses are cyclic quadrilaterals. A cyclic quadrilateral requires all four vertices to lie on the circumference of a circle.
4. How do I prove that a quadrilateral is cyclic?
Ans. To prove that a quadrilateral is cyclic, you can show that the sum of opposite angles is 180 degrees. Another method is to show that the quadrilateral can be inscribed in a circle.
5. Why is understanding cyclic quadrilaterals important in mathematics?
Ans. Understanding cyclic quadrilaterals is important in geometry as it helps in solving problems related to angles and circles. It also helps in proving theorems and properties of quadrilaterals.
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