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mrashrafkotkaat
11.10.2019 •
Mathematics
How do you use coordinates to find the perimeter and area of polygons?
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Ответ:
Step-by-step explanation:
Make a table with the x,y coordinates of each vertex.
Vertical left side of the table A ,B,C D.. A again (From top to bottom)
Horizontal top of the table : x,y( From left to right)
Start at any vertex and go around the polygon in either direction.
Add the starting vertex again at the end.
Combine the first two rows by:
Multiplying the first row x by the second row y
Multiplying the first row y by the second row x
Subtract the second product form the first.
Repeat this for rows 2 and 3, then rows 3 and 4 and so on.
Add these results, make it positive if required, and divide by two.
Ответ:
10 by 4
Step-by-step explanation:
Area = l x b
= 10 x 4
= 40