CADopia - Calculating combined areas

You can find the total area of several combined regions by specifying points or by selecting entities. You can also subtract the areas of entities or polygons from a running total.

To add areas to calculate a combined area

1.       Do one of the following:

·         Choose Tools > Inquiry > Area.

·         On the Inquiry toolbar, click the Area tool ().

·         Type area and then press Enter.

2.       In the prompt box, choose Add Areas Together.

3.       Using one of the following methods, identify the first area:

·         Specify points defining a polygon, and then in the prompt box, choose Done Specifying Area.

·         In the prompt box, choose Add Entities To Area, select the entities you want to add, and then press Enter to complete the calculations.

4.       To complete the command, choose Done in the prompt box.

To subtract areas when calculating a combined area

1.       Do one of the following:

·         Choose Tools > Inquiry > Area.

·         On the Inquiry toolbar, click the Area tool ().

·         Type area and then press Enter.

2.       In the prompt box, choose Add Areas Together.

3.       Using one of the following methods, identify the first area:

·         Specify points defining a polygon, and then in the prompt box, choose Done Specifying Area.

·         In the prompt box, choose Add Entities To Area, select the entities you want to add, and then press Enter to complete the calculations.

4.       In the prompt box, choose Subtract Areas.

5.       Using one of the following methods, identify the area to be subtracted:

·         Specify points defining a polygon, and then in the prompt box, choose Done Specifying Area.

·         In the prompt box, choose Subtract Entities From Area, select the entities you want to subtract, and then press Enter to complete the calculations.

6.       To complete the command, choose Done in the prompt box.

 

To calculate the area of the gasket using the Area command, first add the area of the entire gasket (A), then subtract the areas of the two circles (B and C).

As you select entities, the program displays the calculations. If the command bar is displayed, the information appears there. If the command bar is not displayed, the program opens the Prompt History screen and displays the calculations. The following type of information is an example of what is displayed:

Entity ? Add ? Subtract ? <First point>: Choose Add Areas Together

Adding: Entity ? Subtract ? <First point>: Choose Add Entities to Area

Adding area: <Select entities>: Select the first entity

Area = 64.6259, Perimeter = 33.3049

Total length = 33.3049

Total area = 64.6259

Adding area: <Select entities>: press Enter

Adding: Entity ? Subtract ? <First point>: Choose Subtract Areas

Subtracting: Entity ? Add ? <First point>: Choose Subtract Entities from Area

Subtracting area: <Select entities>: Select the first entity to subtract

Area = 3.1597, Circumference = 6.3012

Total length = 27.0036

Total area = 61.4662

Subtracting area: <Select entities>: Select the second entity to subtract

Area = 3.1597, Circumference = 6.3012

Total length = 20.7024

Total area = 58.3066

Subtracting area: <Select entities>: Press Enter

Subtracting: Entity ? Add ? <First point>: Choose Done