Plot the point (-2,)


 

Draw a perpendicular to the x-axis. That makes a right triangle.  Label the
horizontal side x = the x-coordinate of the point = -2sqrt(2), and the vertical
side y = the y-coordinate of the point sqrt(2)).


 

Calculate the hypotenuse of the right triangle using the Pythagorean
theorem:

r² = x² + y²
r² = (-2)² + ()²
r² = (-2)²()² + 2
r² = 4(2) + 2
r² = 8 + 2
r² = 10
r = 

Label r:



 =  =  = · =  =  =  =  

 =  =  = · =  =  =  =  = 

 =  =  =  =   = 

 =  =  = · =  =  =  = 

 =  =  =  = 

 =  =  =  = -2


Edwin