Open Middle®
Directions: Using the digits 0 to 9, at most once each time, fill in blanks to create a set of 4 points that create either parallel or perpendicular lines, depending on how you connect them.
( ___, ___ ) ( ___, ___ ) ( ___, ___ ) ( ___, ___ )
Hint
What makes lines either parallel or perpendicular?
What is that relationship?
Answer
There are various possible answers, one is:
(3,0) (2,4) (6,5) (7,1)
(3,0) (2,4) (6,5) (7,1)
Source: Bryan Anderson
(5,5) (5,10) (7,5) (7,10)
(5,5) (6,10) (4,5) (7,10)
(6, 14) (6,10) (8, 13) (8,11)
(1,3) (8,9) (0,7) (5,2) Perpendicular.
(5,5) (6,6) (4,7) (7,4)