Given: line AB is parallel to CD and line BD is parallel to AC
Conjecture: ABDC is rectangle.
Find a counterexample.
PLEASE HELP! I'll give you best answer
2007-02-23 05:02:57 · 6 answers · asked by ... 2 in Science & Mathematics ➔ Mathematics
Could be a parallelogram, if A is not directly above C. (If A is directly above C, it would create a 90 degree angle = rectangle)
2007-02-23 05:15:42 · answer #1 · answered by Mathematica 7 · 1⤊ 0⤋
ABDC can be a parallelogram. A rectangle is just a special case of parallelogram, where all angles are right (90 degrees).
2007-02-23 13:19:35 · answer #2 · answered by jcastro 6 · 0⤊ 0⤋
colinear and parralelagram already mentioned but it must be a square or rectangle if on a flat plane and the length of the lines are congruent / if line length is incongruent the figure is a parallelagram
2007-02-23 13:41:19 · answer #3 · answered by Book of Changes 3 · 0⤊ 0⤋
ABDC is a parallelogram, where angle ABD is not a right one.
2007-02-23 13:17:55 · answer #4 · answered by Amit Y 5 · 0⤊ 0⤋
all the points are colinear
2007-02-23 13:09:42 · answer #5 · answered by nbcTVshows 1 · 0⤊ 1⤋
counterexample (please ignore periods)
A...........B
......--------
..../........./
.../........./
..---------
C..........D
nuf said?
2007-02-23 13:15:48 · answer #6 · answered by NotEasilyFooled 5 · 0⤊ 1⤋