Question

Find the perimeter of the rectrangle with vertices at R(-2, 3), S(4, 3), T(4, -1) and U(-2, -1).

Answer 1

I attached a photo where I graphed these vertices in order to count the length and width.  After counting the number of units between R & U I got a width of 4.  And then I counted the units between S & T to get a width of 6.  Using the formula to calculate the perimeter of a rectangle, P = 2(l+w). The perimeter is 20.  

First I added the length plus the width, 4 + 6 and got 10.  Then I did 10 x 2 which is how I got a perimeter of 20.