The blue rectangular box in the figure above is an example of a coordinate plane. These numbers (0,0) are the coordinates of the Origin. Therefore, the origin is denoted by (0,0), where the first ‘0’ in the parenthesis is the X-value and the second ‘0’ is the Y-value. At the origin, the X-value is ‘0’ and the Y-value is ‘0’. The X-axis and Y-axis cross each other in the center. The horizontal direction is the X-direction and vertical direction is Y-direction. The above figure shows one horizontal line called X-axis and one vertical line called Y-axis. What is the meaning of (0,0)? To understand this, we will introduce what is called coordinates and Coordinate Geometry. When you start LOGO Program (see next chapter), the turtle appears at the center of a rectangular area. Concept of Angles (0 Degrees to 360 Degrees) Introduction to Co-ordinates The angles from 0 degrees to 360 degrees are shown in the figure below. GEOMETRICAL SHAPES, AND INTERIOR AND EXTERIOR ANGLES More About AnglesĪ full circle has 360 degrees as shown in the figure below. GEOMETRICAL SHAPES, INTERIOR ANGLES AND EXPERIOR ANGLES POLYGON SHAPE The exterior angles and the interior angles for each polygon are shown in the figure and the table below. The following geometrical shapes will be used in the programming examples in the next units. Acute Angles (0 Degrees to 90 Degrees) Geometry Shapes and Their Exterior Angles The following graph shows examples of angles smaller than 90 degrees. The angles can be larger than or smaller than 90 degrees. For example, the corner of a dining table is an angle. These geometry concepts will be helpful to do LOGO programming effectively. This page is a review of the basic geometry concepts of angles, geometrical shapes, coordinates, and coordinate planes.
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