The Coordinate System and Descriptive Geometry How it

The Coordinate System and Descriptive Geometry How it relates to Inventor

Topic Defined What is a Coordinate System What is Descriptive Geometry • Descriptive geometry is a • Coordinates are a set of representation of threevalues that show an exact dimensional objects in two position on an x and y plane. dimensions, by using a The first number shows the specific set of procedures, distance horizontally and using the x, y and z planes. the second number shows The techniques are the distance vertically up or important for engineering, down. architecture, design and in art.

Axis used in the Coordinate System The y-axis Will always be a vertical line. X- axis Will always be a horizontal line.

Quadrants in the Coordinate System Y Quadrant 2 X is negative Y is positive (-x, y) Quadrant 1 X is positive Y is positive (x, y) X Quadrant 3 X is negative Y is negative (-x, -y) Quadrant 4 X is positive Y is negative (x, -y)

Plotting Point on the Coordinate System Y PLOT THE POINTS 5, 1 X -5 , 5 -3 , -2 1 , -3

Plot the Point for each object

Descriptive Geometry • Is a 3 D object on a 2 D surface.

Coordinate System for Descriptive Geometry

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Conclusion • What is the purpose of the coordinate system? – Shows a point on a plane at its exact position using the x and y coordinates. • How does the Z-axis relate to the X and Y axis? – X-axis shows width of an object. – Y-axis shows height of an object. – Z-axis shows depth of an object.