Hold onto hw Using hatch marks create two pairs figures that 1 Are congruent 2 Are similar Hatch Marks notation that shows that the measurements are equal for angles arcs line segments etc ID: 429506
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Slide1
Bell Ringer: Hold onto hw
Using hatch marks create two pairs figures that… 1. Are congruent 2. Are similar Hatch Marks – notation that shows that the measurements are equal for angles, arcs, line segments, etc. Slide2Slide3
Bell Ringer: Hold onto hw
Draw a regular heptagon, use hash marks to show equal sides and angles. Does this figure possess rotational symmetry? If
so, say all the possible rotations that would carry it onto
itself
as well as what order of rotational symmetry it has.
Does this figure
possess any
lines of reflection? If so, draw them on your figure.Slide4
Partner Grading
Trade your homework with a peer and write your initial on the HWUnbiasedly grade this person’s workReturn to Owner to make correctionsSlide5
Name of Shape
Order of Rotational SymmetryMinimum Angle of Rotation to Map Onto Self
Number of Lines of Symmetry
Image Drawn with Lines of Symmetry
Scalene Triangle
Order: 1
360°
Lines:
0
Isosceles Triangle
Order: 1360°Lines: 1 Equilateral TrianglesOrder: 3120°Lines: 3SquareOrder: 490°Lines: 4Rectangles Order: 2180°Lines: 2 Parallelograms Order: 2180°Lines: 0 Rhombuses Order: 490°Lines: 2 Irregular QuadrilateralsOrder: 1360°Lines: 0 Slide6
Name of Shape
Order of Rotational SymmetryMinimum Angle of Rotation to Map Onto Self
Number of Lines of Symmetry
Image Drawn with Lines of Symmetry
Equilateral Triangles
Order: 3
120°
Lines:
3
Square
Order: 490°Lines: 4Regular PentagonsOrder: 572°Lines: 5 Regular HexagonOrder: 660°Lines: 6 Regular n-sided FiguresOrder: n(360/n)°Lines: n CirclesOrder: ∞AnyLines: ∞Slide7
Great Resources
http://math.tutorvista.com/algebra/rotational-symmetry.htmlhttps://www.mathsisfun.com/geometry/symmetry-line-plane-shapes.htmlSlide8
Classwork/HW
Turn in when doneRotations and Reflections WrkshtTextbook Pages 859-8601-3; 5-8; 29-32Slide9
Wrksht #1 and 2
1. A regular hexagon is rotated on a coordinate plane. Which rotation would result in a hexagon with vertices at the same coordinates as the vertices of the original hexagon?a 60º counterclockwise rotation about the center of the hexagona 90° counterclockwise rotation about the center of the hexagona 60° counterclockwise rotation about one of the vertices of the hexagon
a 90° counterclockwise rotation about one of the vertices of the hexagon
2. Use the answer from number one and perform that rotation on the image below.
Label all points on your graph and give their ordered pairs.