Area of polygons worksheet

Find the area of the shapes when their vertices are given.

1 a.

triangle with vertices (-3, -9), (-3, 0), and (-6, -9).
 
 
 
 
1 b.

triangle with vertices (-9, 1), (-9, 3), and (8, 1).
 
 
 
 
2 a.

triangle with vertices (9, 2), (9, 9), and (-10, 2).
 
 
 
 
2 b.

triangle with vertices (-1, -9), (-1, -8), and (-2, -9).
 
 
 
 
Page 2

Answer Key

1 a. 

The area is 13.5 square units.

 
1 b. 

The area is 17 square units.

 
2 a. 

The area is 66.5 square units.

 
2 b. 

The area is 0.5 square units.

 


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