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Geometry 21 Online
OpenStudy (anonymous):

Need help. Two column proving queston for congruent triangles. I'm given two triangles, Triangle ACB, and Triangle ADE. What would be the given?

OpenStudy (anonymous):

an isosceles triangle with "A" at the top and the base being "B" on the left, and "C" on the right. The bisector is AD and "D" is between "B" and "C" on the base of this triangle. There is also a segment drawn from "D" to "E". a point on the AC segment on the right side of the triangle. does this help?

OpenStudy (anonymous):

I think I got that wrong, give me a second. I have a picture as well.

OpenStudy (anonymous):

OpenStudy (anonymous):

i think my answer is still right ;-;

OpenStudy (anonymous):

;-; Wait, so what's the given?

OpenStudy (anonymous):

let me look back at the problem

OpenStudy (anonymous):

whats given is the triangle ABC, AD=CB, and AC>DB Prove: M angle ADC> M angle DCB i believe

OpenStudy (anonymous):

;-; Thank you

OpenStudy (anonymous):

np ;-; xD

OpenStudy (anonymous):

Wait, I think I have to prove it using one of the Postulates.

OpenStudy (anonymous):

hmmm

OpenStudy (anonymous):

The SAS, or Side-Angle-Side, Congruence Postulate states that two triangles are congruent if two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle. The SSS, or Side-Side-Side, Congruence Postulate states that two triangles are congruent if all three sides of one triangle are congruent to all three sides of another triangle The ASA, or Angle-Side-Angle, Congruence Postulate states that two triangles are congruent if two angles and the included side of one triangle are congruent to two angles and the included side of another triangle. The AAS, or Angle-Angle-Side, Congruence Postulate states that two triangles are congruent if two angles and one of the non-included sides of one triangle are congruent to two angles and one of the non-included sides of another triangle. The HL, or Hypotenuse-Leg, Congruence Postulate states that two right triangles are congruent if the hypotenuse and one leg of one right triangle are congruent to the hypotenuse and one leg of another right triangle. CPCTC, which stands for Corresponding Parts of Congruent Triangles are Congruent, Postulate states that if we know that two triangles are congruent, we can conclude that all corresponding angles and all corresponding sides are congruent.

OpenStudy (anonymous):

id still say M angle ADC> M angle DCB

OpenStudy (anonymous):

wait

OpenStudy (anonymous):

let me read it xD

OpenStudy (anonymous):

i still think its ADC> M angle DCB, but its a Postulates, so its what YOU believe, so i think you should do it. but if u need help just let me know.

OpenStudy (anonymous):

We're supposed to use the postulates. Give a statement, and then put down which postulate we would use to prove it.

OpenStudy (anonymous):

Yes ik. Example: I need to prove__________ from whats given, (________). Just fill in the blanks :) if you need more help plz let me know.

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