Transformations and spreadsheets       Transformations   Summary of Transforming Matrices         Summary of Transforming Matrices Rotation through 90 degrees        Rotation through 90 degrees Mathematics and Art             Mathematics and Art Area of intersting shapes       Area of Intersting Shapes Area of a triangle given 3 sides       Area of a triangle given 3 sides Proof of Heron's Formula       Proof of Heron's formula Area of Triangles, Exercise          Area of Triangles, Exercise Supplementary and Complementary Angles     Supplementary and Complementary angles Properties of parallel lines        Properties of parallel lines Proof of the sum of the angles of a triangle          The sum of the angles of a triangle         Exterior and interior angles of a triangle          Exterior and interior angles of a triangle The concept of gradient (slope) and intercept      Straight Line Graph      Sinusoidal waves     Sinusoidal waves   Circumscribed circle and angle in a semicircle    Circumscribed circle and angle in a semicircle Inscribled circle and angles in major and minor sectors    Inscribed circle and angles in major and minor sectors Cyclic quadrilateral and angles subtended by an arc     Cyclic quadrilateral angles subtended by an arc Tangent to a circle property and alternate segement theorem    Tangent to a circle property and alternate segment theorem Pythagoras theorem statement     Pythagoras theorem statement   Pythagoras theorem, practice           Pythagoras theorem, practice 'Visual Proof' of Pythagoras Theorem    'Visual Proof' of Pythagoras Theorem Proof of Pythagoras Theorem            Proof of Pythagoras Theorem       Trigonometry definition     Trigonometry, Definitions Trigonometry       Trigonometry Application of trigonometry     Applications of trigonometry    Exercise on Trigonometry     Exercise on Trigonometry      Similarity                               Similarity                                                                    Similarity example 1      Similarity, example 1 Similarity example 2    Similarity, example 2 Regular polygons investigation                  Regular Polygons Circumference and Diameter Relationship (Investigation)    Relationship between circumference and diameter Relationship between circumference and diameter (practice)      Relationship between circumference and diameter (practice)      Logo programming         Logo programming A circle and a triangle (shaded area)        A circle and a triangle A square within a circle (shaded area)       A square within a circle Concentric circles (shaded area)        Concentric circles No entry sign (shaded area)         No entry sign