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true or false? Help me Plz!!!
If two triangles have two angles and the included side congruent, the triangles are congruent. ASA (angle-side-angle).
so Its true
Explain why it is true.
The triangles are congruent but not by ASA.
Because it is a theorem
Which ways of proving two triangles congruent do you know?
@methstudent55: if two triangles have two angle congruent, the third is also congruent.
@mathstudent55: if two triangles have two angle congruent, the third is also congruent. It is not SAS because we only have one common side, and we do not know congruence of the other sides.
@mathmate You're correct. You can do it by ASA by first stating that the third angles are congruent, but there is a quicker way of doing it that does not require that extra step.
WAIT so its true
It still takes an extra step.
There is a way that just by looking you can immediately conclude the triangles are congruent with out any extra steps.
To prove by SAS, you need to show that one other pair of sides are congruent.
o its false because not much information, right?
@ DorelTibi: sorry that we are discussing the semantics of things, but are you able to show that the triangles are congruent?
It's not SAS. We don't have info on two sides. We only know about the side in common.
Here it is: AAS. If two angles of a triangle and a not included side are congruent to corresponding parts of another triangle, the triangles are congruent.
In fact, AAS is the equivalent of ASA, since when two angles are congruent, then congruence of any other corresponding side is sufficient to show congruence. Equivalence means that all AAS cases can be shown to be ASA and vice-versa.
Indeed, AAS is easier.
In the end, if you do it by ASA, you need to show BD is congr to itself and