Geometry
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Focus on the yellow surface of Cubee “D”. You can see many lines on this surface. These are the intersecting lines that make up the yellow grid.
Intersecting lines are two lines that share exactly one point. This shared point is called the point of intersection.
The yellow surface grid is a network of horizontal and vertical lines. Each line is exactly one decimeter long. Each horizontal and vertical line cross each other, at exactly a ninety-degree angle.
Note: if you add the four ninety degree angles at the point of intersection, they add up to three hundred and sixty degrees. Focus on and memorized that number. It is very important for future use.
The horizontal lines are separated from each other by exactly one centimeter. Each vertical line is separated from each other by one centimeter.
These lines form a pattern of squares, ten horizontally and ten vertically. Multiply them together, and in this case there are one hundred square centimeter. These combined together form exactly one polygon. This polygon is square decimeter.
Intersecting lines are two lines that share exactly one point. This shared point is called the point of intersection.
The yellow surface grid is a network of horizontal and vertical lines. Each line is exactly one decimeter long. Each horizontal and vertical line cross each other, at exactly a ninety-degree angle.
Note: if you add the four ninety degree angles at the point of intersection, they add up to three hundred and sixty degrees. Focus on and memorized that number. It is very important for future use.
The horizontal lines are separated from each other by exactly one centimeter. Each vertical line is separated from each other by one centimeter.
These lines form a pattern of squares, ten horizontally and ten vertically. Multiply them together, and in this case there are one hundred square centimeter. These combined together form exactly one polygon. This polygon is square decimeter.
Point of Intersection
Horizontal Line
Vertical Line
When I was about eight years old, I received a geometry set as a gift. Since then, I have been very interested in this subject.
I am still studying geometry, design and technical drawing. These three areas of study are closely related. Geometry is the one you must start with. It is a very old subject. To be a good student, you should research geometry.
Geometry in a complex subject but when you make the cubic decimeter you concentrate on two parts of geometry, intersecting lines and square grids.
Point of Intersection
The Square