POLYGONS

Polygon

- a 3 or more sided closed figure

POLYGONS

3 -

4 -

5 -

6 -

7 -

8 -

TriangleQuadrilateralPentagon HexagonHeptagonOctagon

9 -

10 -

11 -

12 -

n -

Nonagon

Decagon

Hendecagon

Dodecagon

n-gon

Area of Polygons

Area - space inside

Area is always measured in square units (A=24 units squared or 24 square units)

Congruent figures have congruent areas.

Parallelogram –

Rectangle –

Square –

Triangle -

A – bhh is the perpendicular

distance between the bases

A = bh

A = s2 or bh

1/2bh

Trapezoid –

Rhombus –

Circle -

½ h(d1+ d2)

½d1d2

r2

Regular Polygons - A=1/2Pa

P - perimeter

a - apothem

-a segment from the center perpendicular to a side.