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Mathematics 9 Online
OpenStudy (anonymous):

Write a two column proof. Given= <3 is congruent to <4 Prove <1 is congruent to <2

OpenStudy (anonymous):

what's the < represent an angle or triangle? I want to be sure so I can possibly help.

OpenStudy (anonymous):

where is the graph?

OpenStudy (anonymous):

i meant angles

OpenStudy (anonymous):

|dw:1350996550391:dw|

OpenStudy (anonymous):

by looking at this <3 is congruent to <1 and <2 with <4 since as stated <3 and <4 is congruent that means <1 and <2 is also congruent with each other

OpenStudy (anonymous):

< represents as an angle

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

we have to write out a two-column proof, included with the property's/thermos you used to get <1 is congruent to <2

OpenStudy (anonymous):

just look at example 1

ganeshie8 (ganeshie8):

start wid whats given

ganeshie8 (ganeshie8):

1. \(\angle 3 \cong \angle4\) a. Given

ganeshie8 (ganeshie8):

1. \(\angle 3 \cong \angle4 \) a. Given 2. \(\angle 3 \cong \angle1 \) b. Vertical Angles 3. \(\angle 4 \cong \angle2 \) c. Vertical Angles

OpenStudy (anonymous):

Angles are congruent if their measures, in degrees, are equal. Note: “congruent” does not mean “equal." While they seem quite similar, congruent angles do not have to point in the same direction. Then we know that by the vertical angle theorem that if two angles are vertical angels then they have equal angles. So this solves your problem, since both <3 and <4 are equal there vertical angles will be equal and those angles will be congruent. Which should be correct.

OpenStudy (anonymous):

thank you guys!

OpenStudy (anonymous):

Basically what ganeshie wrote

ganeshie8 (ganeshie8):

1. \(\angle 3 \cong \angle4 \) a. Given 2. \(\angle 3 \cong \angle1 \) b. Vertical Angles 3. \(\angle 4 \cong \angle2 \) b. Vertical Angles 4. \(\angle 1 \cong \angle2 \) b. By Substitution

ganeshie8 (ganeshie8):

yw

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