Скачать или смотреть Circle Geometry | Episode 10 - The Tan - chord Theorem (Angles in alternate segment)

📐 Alternate Segment Theorem (Tangent–Chord Theorem) Explained | Circle Geometry

In this lesson, we explore the Alternate Segment Theorem, also known as the Tangent–Chord Theorem, one of the key circle geometry theorems tested in EGCSE / IGCSE Mathematics.

🔑 Short form:
Angle between tangent and chord = angle in alternate segment

📘 Full statement:
The angle between a tangent and a chord through the point of contact is equal to the angle subtended by the chord in the opposite arc of the circle.

🎯 In this video, you will learn:

What a tangent and chord are
How to identify the alternate segment in a diagram
How to apply the theorem correctly in exam questions
Common mistakes learners make and how to avoid them
How this theorem links with angles in the same segment

📝 Exam tip:
Always state the theorem clearly before using it as a reason when solving angle-chasing problems.

👨🏽‍🏫 Perfect for:

Form 4 & Form 5 learners
EGCSE / IGCSE exam revision
Teachers looking for a clear teaching explanation

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