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# Geometry Online Resources by Chapter

1 2 3 4 5 6 7 8 9 10 11 12

Links marked as PBS are animated lessons from the PBS Learning Media site
Links marked as OpenRef are visual lessons from the Math Open Reference site

Ch. 1
Essentials of Geometry
Online Resources
1.1 Identify Points, Lines and Planes
1.2 Segments and Congruence
1.3 Midpoint and Distance Formulas PBS1  PBS2
1.4 Measure and Classify Angles Khan
1.5 Describe Angle Pair Relationships Khan   PBS
1.6 Classify Polygons OpenRef
1.7 Perimeter, Circumference, Area

Ch. 2
Reasoning and Proof
Online Resources
2.1 Inductive Reasoning
2.2 Conditional Statements
2.3 Deductive Reasoning
2.4 Postulates and Diagrams
2.5 Properties from Algebra
2.6 Proofs - Segments and Angles
2.7 Proofs - Angle Pair Relationships

Ch. 3
Parallel and Perpendicular Lines
Online Resources
3.1 Pairs of Lines and Angles
3.2 Parallel Lines and Transversals Khan 1   Khan2   Khan3
3.3 Proving Lines Parallel
3.4 Slopes of Lines
3.5 Graphs and Equations of Lines
3.6 Theorems for Perpendicular Lines

Ch. 4
Congruent Triangles
Online Resources
4.1 Triangle Sum Properties Khan
4.2 Congruence and Triangles
4.3 Triangles Proofs - SSS
4.4 Triangles Proofs - SAS & HL
4.5 Triangles Proofs - ASA & AAS
4.6 Using Congruent Triangles - CPCTC
4.7 Isosceles and Equilateral Triangles
4.8 Congruence Transformations

Ch. 5
Relationships within Triangles
Online Resources
5.1 Midsegment Theorem
5.2 Perpendicular Bisectors
5.3 Angle Bisectors of Triangles
5.4 Medians and Altitudes of Triangles
5.5 Inequalities in a Triangle PBS
5.6 Inequalities in Two Triangles

Ch. 6
Similarity
Online Resources
6.1 Ratios, Proportions and Geometric Mean PBS
6.2 Problem Solving with Proportions PBS
6.3 Similar Polygons
6.4 Triangle Similarity Proofs - AA Khan
6.5 Triangle Similarity Proofs - SSS and SAS Khan
6.6 Proportionality Theorems
6.7 Similarity Transformations

Ch. 7
Right Triangles and Trigonometry
Online Resources
7.1 The Pythagorean Theorem Khan
7.2 Converse of Pythagorean Theorem
7.3 Similar Right Triangles
7.4 Special Right Triangles Khan 1  Khan2  Khan3   PBS
7.5 The Tangent Ratio
7.6 The Sine and Cosine Ratios
7.7 Solving Right Triangles

Ch. 8
Online Resources
8.1 Angle Measures in Polygons
8.2 Properties of Parallelograms
8.3 Proof - Quadrilateral is a Parallelogram
8.4 Rhombuses, Rectangles and Squares Khan
8.5 Trapezoids and Kites

Ch. 9
Properties of Transformations
Online Resources
9.1 Translate Figures and Vectors
9.2 Properties of Matrices
9.3 Reflections
9.4 Rotations
9.5 Compositions of Transformations
9.6 Symmetry
9.7 Dilations PBS

Ch. 10
Properties of Circles
Online Resources
10.1 Properties of Tangents
10.2 Arc Measures
10.3 Properties of Chords
10.4 Inscribed Angles and Polygons Khan   PBS
10.5 Other Angle Relationships in Circles PBS
10.6 Segment Lengths in Circles
10.7 Graphs and Equations of Circles

Ch. 11
Measuring Length and Area
Online Resources
11.1 Triangles and Parallelograms Khan
11.2 Trapezoids, Rhombuses and Kites
11.3 Perimeter and Area of Similar Figures
11.4 Circumference and Arc Length Khan    PBS
11.5 Areas of Circles and Sectors Khan    PBS
11.6 Areas of Regular Polygons
11.7 Geometric Probability

Ch. 12
Surface Area and Volume of Solids
Online Resources
12.1 Solids
12.2 Surface Area of Prisms and Cylinders Khan   PBS1   PBS2
12.3 Surface Area of Pyramids and Cones PBS1   PBS2   PBS3
12.4 Volume of Prisms and Cylinders Khan1  Khan2   PBS
12.5 Volume of Pyramids and Cones PBS1   PBS2
12.6 Surface Area and Volume of Spheres PBS1   PBS2
12.7 Similar Solids PBS