Discovering Discovering Parallelograms Parallelograms

BD: ____________
DC: ____________
CA: ____________
Now drag a vertex (Select and use the hand tool – Green ALPHA key) and
make a conjecture about opposite sides of a parallelogram:
_________________________________________________________
6. Verify that opposite sides of ABCD are parallel.
Measure the slope of each side: F5ΨMeasure>Slope, then select side.
m AB = ________
m CD = ________
m AC = ________
m BD = ________
7. Draw diagonal AD: F2Ψ Segment, then select point A, hit , drag to
point D and hit .
Are the two triangles congruent? _______
If yes, name the pair of congruent
triangles:
∆______ ≅ ∆_______
How do you know (or how can you prove) that they are congruent triangles?
Can you use SAS, ASA, or SSS theorems?
Explain how you would prove that the triangles are congruent.
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