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Warm-up. Grab your clicker for todays warm-up. Geometry: Chapter 6. 6.1: Polygons. All polygons: What is special about them?. Polygon: A plane figure that is formed by 3 or mores segments. Sides: Segments Vertex: Where sides meet
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Warm-up • Grab your clicker for todays warm-up
Geometry: Chapter 6 6.1: Polygons
Polygon: A plane figure that is formed by 3 or mores segments. • Sides: Segments • Vertex: Where sides meet • Diagonal: Segment that connects nonconsecutive vertices.
Classification of Polygons by their number of sides Triangle Octagon Quadrilateral nonagon Pentagon decagon Hexagon dodecagon heptagon N-gon
Warm-up • Name the following polygons
Quadrilateral Interior Angles Theorem • The sum of the measures of the four angles of a quadrilateral equals 360˚ • Ex: ____ + ____ + ____ + ____ = 360
Reflectional Symmetry • When a figures reflected image across a line coincides with the preimage U LOVE GEOMETRY!
Line of symmetry: a line that a figure has if it can be mapped onto itself by a reflection
Rotational symmetry if the figure has at least one rotation image, not counting 0° or 360°, that coincide with the original figure. Describing Rotational Symmetry: State the number of positions the figure coincides with itself, including original position