A shape has when a line divides it into 2 congruent (_________) parts. line symmetry Shapes can be reflected over _______________, _________________, or ______________ (diagonal) lines. Ex. Identify the triangles that are related to the shaded triangle by a line of reflection. Show the position of each line of symmetry. 8. 6 Rotations & Rotational Symmetry – A shape has when it coincides with itself after a rotation of less than _____̊ about its rotational symmetry ___________. The is the # of times the shape _____________ with itself within one ______________. Order of Rotation = ___ = ____ Angle of Rotation Order of Rotation ̊___ ̊___ Ex. Determine which hexagons below have rotational symmetry. State the order of rotation and the angle of rotation symmetry. 8. 7 Identifying Types of Symmetry – ________________, _________________, and _________________ 3 Types of Transformations: ____________ Symmetry & ___________________ Symmetry 2 Types of Symmetry: After a transformation, some images will have: symmetry __________ symmetry ___________ ________________ symmetry _________ symmetry & _______________ symmetry Both
A shape has line symmetry when a line divides it into 2 congruent (_________) parts. Shapes can be reflected over _______________, _________________, or ______________ (diagonal) lines. Ex. Identify the triangles that are related to the shaded triangle by a line of reflection. Show the position of each line of symmetry. 8. 6 – Rotations & Rotational Symmetry A shape has rotational symmetry when it coincides with itself after a rotation of less than _____̊ about its ___________. The Order of Rotation is the # of times the shape _____________ with itself within one ______________. Angle of Rotation = ___ ̊___ Order of Rotation = ____ ̊___ Ex. Determine which hexagons below have rotational symmetry. State the order of rotation and the angle of rotation symmetry. 8. 7 – Identifying Types of Symmetry 3 Types of Transformations: ________________, _________________, and _________________ 2 Types of Symmetry: ____________ Symmetry & ___________________ Symmetry After a transformation, some images will have: __________ symmetry ___________ symmetry ________________ symmetry Both _________ symmetry & _______________ symmetry
grade_9_math_exam_review_notes.docx