area of polygons

lesson 6.0A

what is a polygon

a closed figure made up of line segments (not curved)

Regular polygon

all sides and all angles are not congruent

 Irregular polygon

Size and angles have different measures

Concave

One or more interior angle is bigger than 180°

Convex

No interior angles bigger than 180°

Qualities of a triangle

3 sides 3 vertices

Qualities of a Quadrilateral

4 sides 4 vertices

Qualities of a Parallelogram

Opposite side parallels

Qualities of a Trapezoid

One pair of parallel sides

Qualities of a Isosceles trapezoid

One pair of parallel sides, non parallel sides are congruent

Qualities of a rhombus

All three sides are equal, opposite sides are parallel

Qualities of a rectangle

Opposite sides are parallel and congruent 90° angles

Qualities of a kite

adjacent angles are congruent

Qualities of a square

All sides are equal, all angles are 90°, opposite sides are parallel

pentagon

Five sides

Hexagon

Six sides

Heptagon

Seven sides

Octagon

Eight sides

Nonagon

Nine sides

Decagon

10 sides

11 sides

Hendecagon

12 sides

Dadagon

How to find the area And perimeter of a triangle

P = A + B + C

How to find the area And perimeter of a rectangle

A = LW , P = 2L+ 2w (Where L is the length and W is the width)

How to find the area And perimeter of a square

A = s^ 2 , P= 4s (where s is the side length)