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Shapes with flat surfaces

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lines that cross at 90 degrees

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Vertices are the highest point ; the top or apex

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and regular polygon find the sum of the measures of interior angles of a polygon find the sum of.

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1 Objectives Define polygon, concave / convex polygon, and regular polygon Find the sum of the measures of interior angles of a polygon Find the sum of. - ppt download

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3 Concave and Convex Polygons A convex polygon has no diagonal with points outside the polygon A concave polygon has at least one diagonal with points outside the polygon

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a boundary

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Ver

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more ... Another name for reflection symmetry. One half is the reflection of the other half. The "Line of Symmetry" (shown here in white) is the imaginary line where you could fold the image and have both halves match exactly.

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Face. In any geometric solid that is composed of flat surfaces, each flat surface is called a face. The line where two faces meet is called an edge. For example, the cube above has six faces, each of which is a square.

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An object's degree of rotational symmetry is the number of distinct orientations

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A polygon is regular when all angles are equal and all sides are equal.

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Vide
Empty

more_vert

Empty
edge
edge
a boundary 

Vertices
Vertices
Ver

Line Symmetry
Line Symmetry 
more ... Another name for reflection symmetry. One half is the reflection of the other half. The "Line of Symmetry" (shown here in white) is the imaginary line where you could fold the image and have both halves match exactly.

faces
faces
a flat surface where two lines meet and make an edge.
rotational symmetry
rotational symmetry
An object's degree of rotational symmetry is the number of distinct orientations 
regular polygon
regular polygon 

A polygon is regular when all angles are equal and all sides are equal. 

line symmetry
line symmetry
it means lines that always meet and have exactly the same reflection
Parallel Lines

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it means lines that always meet and have exactly the same reflection

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Lines that never meet.