Circle Theorem - Resource Pack
Lesson Contents: Circle Theorems
Download Includes:
A comprehensive PowerPoint lesson designed for interactive use with a clicker, mouse, or keyboard to navigate through animations and display fully animated and worked solutions.
Topic of Study: Circle Theorems
Differentiated Objectives:
Developing Learners will be able to:
Apply circle theorems to find missing angles.
Secure Learners will be able to:
Justify, with reason, the circle theorems they apply to find missing angles.
Excelling Learners will be able to:
Solve unfamiliar problems using circle theorems.
Main Components:
The main segment of the lesson unfolds with a step-by-step approach:
Walked through examples demonstrate the application of circle theorems.
Practice questions on accompanying worksheets progress from basic queries on the just-introduced theorem to exam-style questions utilizing each of the theorems previously introduced.
All solutions are provided directly within the PowerPoint presentation for easy reference.
Circle Theorem Statements:
Angles in the Same Segment:
Angles in the same segment of a circle are equal.
Opposite Angles in a Cyclic Quadrilateral:
Opposite angles in a cyclic quadrilateral add up to 180 degrees.
Angle at the Center:
The angle at the center of a circle is twice any angle at the circumference subtended by the same arc.
Angles in a Semi-Circle:
Angles formed in a semi-circle are always right angles.
Alternate Segment Theorem:
An angle between a chord and a tangent is equal to the angle in the alternate segment.
Tangent-Radius Perpendicularity:
A radius at the point of tangency to a circle is perpendicular to the tangent.
*Cyclic Quadrilateral Diagonals:
The diagonals of a cyclic quadrilateral bisect each other at right angles.
Chord Bisection:
A chord that passes through the center of a circle is bisected by the circle into two equal parts.
This lesson is structured to empower learners at various levels, ensuring a comprehensive understanding of circle theorems and proficiency in their application across different scenarios.