1. Determine the vertical side (2 units) and horizontal side (6 units) lengths by counting on the grid, or using the coordinates.
2. Draw a right triangle by dropping a vertical side and a horizontal side.
3. Use the Pythagorean theorem for right triangles to determine the diagonal length 2^2 + 6^2 = c^2
4. 40 = c^2
5. Squared 40 = squared c^2
6. Squared 40 is between squared 36 and squared 49 so it is about 6.3 units
7. Determine the distance between the two points to be approximately 6.3 units.