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```Definition of a polygon
Characteristics of a polygon
a two-dimensional (plane) shape
with straight lines
Classified by the number of sides they have
Convex figures
Concave figures
A polygon whose
vertices all point outward
A polygon that has at least one
vertex that points inward
Isosceles triangle
A triangle with two
congruent (equal) sides
Equilateral
Triangle
A triangle with three
congruent (equal) sides
Scalene
triangle
a triangle that has
no congruent (equal) sides
A right angle triangle
A triangle that has one 90° angle
A square
-Polygon
- Rectangle where all sides are
equal
-4 right angles
A rectangle
-Polygon
-2 pairs of opposite
Parallel equal sides
-4 right angles
A rhombus
A polygon with exactly 4 sides
-Polygon
-all sides have equal length
A trapezoid
-Polygon
-2 parallel sided only
A parallelogram
-Polygon
-Opposite sides are
parallel
Pentagon
-Polygon with exactly
five sides
Hexagon
-Polygon with exactly
six sides
Octagon
-Polygon with exactly
eight sides
Heptagon
-Polygon with exactly seven sides
Nonagon
-Polygon with exactly nine sides
Decagon
-Polygon with exactly ten sides
Diameter : a line that passes through the
A two-dimensional shape made by circle’s center
drawing a curve that is always the Radius : a line that joins the circle’s center to
the outside of the circle
same distance from the center
Circle
Circumference : the length of the boundary
line that forms the circle, the perimeter
Formula : diameter X π or 2πr
π≈3.14
Area of circle : πr2
Construct parallel lines
Construct perpendicular lines
Two lines running in the same
direction that will never
touch each other
Two lines that form a right angle
```
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