Title: Geometry Applications: Geometry Basics: Quadrilaterals

Title: Geometry Applications: Geometry Basics: Quadrilaterals

[Music]

[Music]

STONEHENGE IS ONE OF THE WORLD'S MOST FAMOUS

LANDMARKS AND IT IS MOSTLY THOUGHT OF

AS A CIRCULAR STRUCTURE.

BUT WHAT MAKES STONEHENGE POSSIBLE

IS THE POST AND LINTEL CONSTRUCTION

WHERE SLABS OF STONE ARE ARRANGED

HORIZONTALLY AND VERTICALLY.

THE MOST COMMON EXAMPLE OF

POST AND LINTEL CONSTRUCTION

IS THE FRAMEWORK AROUND THE DOORWAY IN YOUR HOUSE.

THE POSTS ARE THE VERTICAL SUPPORTS

AND THE LINTEL IS THE HORIZONTAL SPAN.

THAT DEFINES THE ENTRYWAY

AND THE SHAPE IS USUALLY A RECTANGLE.

IN FACT, THE FRONT OF MOST HOMES IS ANOTHER

EXAMPLE OF A POST AND LINTEL STRUCTURE.

THE TRIANGULAR ROOF USUALLY SITS ON

A POST AND LINTEL BASE.

IN THE ANCIENT WORLD THIS SAME TYPE OF CONSTRUCTION

WAS USED WITH TEMPLES.

WE ARE QUITE AT HOME WITH QUADRILATERALS.

SQUARE AND RECTANGULAR FRAMES

ARE FOUND THROUGHOUT THE HOUSE.

IN FACT, MOST HOMES HAVE A FLOOR PLAN

THAT IS MADE UP OF RECTANGLES AND SQUARES.

WHILE THERE ARE SOME CIRCULAR SHAPED HOMES

AND SOME THAT ARE BASED ON POLYGONS,

THE OVERWHELMING MAJORITY USE QUADRILATERAL FORMS.

WHY ARE SQUARE AND RECTANGULAR FORMS

SO PREVALENT IN HOMES?

WHAT PROPERTIES OF THESE SHAPES MAKE THEM IDEAL

FOR THESE TYPES OF STRUCTURES?

IN THIS PROGRAM YOU WILL LEARN ABOUT