Area on a Coordinate Plane 2

Directions: Using the integers -9 to 9 at most one time each, fill in the boxes to create coordinates that represent the vertices of the triangle with the smallest possible area.


How can you graphically estimate your triangle’s area before you calculate it?


The triangle with the smallest possible area that has been found so far has an area of 2.5 units2 from the coordinates (-1, 1), (0, 2), and (1, -2). If you find one with less area, share it in the comments.

Source: Robert Kaplinsky

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Similar Triangles 2

Directions: Using the digits 0 to 9 at most one time each, create two similar …


  1. In the answer given, integer 1 was used twice. I thought this wasn’t allowed.

  2. I have a student who found coordinates that result in a triangle with area of .5 square units.

    A (4, 5)
    B (3, 6)
    C (2, 8)

    Said student not having learned the matrix determinant yet, we used the calculator at,rows%20%28or%20columns%29%20%5Ba-e%2C%20b-f%5D%20and%20%5Bc-e%2C%20d-f%5D.

    to determine the area of the triangle.

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