Polygon Preview Lesson

geometry preview lesson:

Classifying 2D Shapes

Polygons

• Regular : All sides and angles are Congruent

• Irregular : Any polygon that is not Regular.

Polygons:

• are not circles

• do not have any curved lines

• must be closed (no open spaces

• are only 2D

Parts of a Polygon

• Vertex : Point where two sides intersect.

• Side : Line Segment between vertices.

• Interior Angle : Angle inside the polygon formed by two sides.

• Exterior Angle : Angle outside the polygon formed by two sides.

Examples of Hierarchy of Shapes

Multiple Choice

What is an angle?

• When two lines keep going

• When two rays intersect

• Those curvey thingy majigies

Multiple Choice

_____ lines intersect, or cross, at a 90 degree angle

• Parallel

• Perpendicular

Let's get into some shapes!

Poll

Are all shapes (including circles) polygons?

• Yes

• No

Multiple Choice

A quadrilateral has 4 sides, 4 angles and 4 __________.

• Vertices

• Degrees

• Rays

• Parallels

Multiple Select

Which of the following shapes are not polygons?

Multiple Choice

Tell whether the polygon is regular, equilateral, or equiangular.

• Regular

• Equiangular

• Equilateral

• None of the Above

Multiple Choice

Is the figure a polygon? Is it convex or concave?

• Not a polygon, convex

• Polygon, convex

• Not a polygon

• Polygon, concave

Multiple Choice

Is the figure a polygon? Is it convex or concave?

• Not a polygon, convex

• Polygon, convex

• Not a polygon

• Polygon, concave

Multiple Choice

The name of this polygon is

• Heptagon

• octagon

• Hexagon

• Nonagon

Multiple Choice

Name the polygon.

• Octagon

• Pentagon

• Hexagon

• Quadrilateral

Multiple Choice

The name of a polygon with 5 sides is:

• Pentagon

• Nonagon

• Fivetagon

• Octagon

Multiple Choice

How many sides does a decagon have?

• 12

• 11

• 9

• 10

Multiple Choice

What is the name of a 12-sided polygon

• Decagon
• Dodecagon
• Dozengon
• Noonagon

Multiple Choice

Diagonals have points that are outside the polygon

• Convex polygon

• Concave polygon

• Regular polygon

• Dodecagon

Multiple Choice

What is a regular polygon?

• A polygon that has 1 set of parallel sides and 1 right angle.

• A polygon that has 2 sets of parallel sides and 2 right angles.

• A polygon that has 2 right angles and 2 sides congruent.

• A polygon in which all sides and all angles are congruent.

Multiple Choice

Which polygon has 14 diagonals?

• Hexagon

• Octagon

• Nonagon

• Heptagon

Multiple Choice

A nonadecagon is a 19-sided polygon.

• True

• False