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Mathematics 24 Online
OpenStudy (anonymous):

In the figure below, segment AC is congruent to segment AB. Which statement is used to prove that angle ABD is congruent to angle ACD? Answer Angle CAB is congruent to angle CBA. Angle DAC is congruent to angle DAB. Triangle ACD is similar to triangle ABD. Segment AD is congruent to segment AC.

OpenStudy (anonymous):

OpenStudy (anonymous):

ok im not gonna lie but im really stumped on like 6 questions and its a 60 question test and im supose to be done in 20 min.. is there anyway you can help

jimthompson5910 (jim_thompson5910):

well this is definitely an isosceles triangle

jimthompson5910 (jim_thompson5910):

but the problem is that we don't know the angle ADC

jimthompson5910 (jim_thompson5910):

so we can't say for sure that DAC = DAB....but if ADC = 90, then we can

jimthompson5910 (jim_thompson5910):

basically the whole proof hinges on this

jimthompson5910 (jim_thompson5910):

so you can see the dilemma

OpenStudy (anonymous):

ya.. i get that somewhat

jimthompson5910 (jim_thompson5910):

but through the process of elimination, the other choices are completely false as well...so I guess ADC = 90 afterall

OpenStudy (anonymous):

because it is bisecting?

jimthompson5910 (jim_thompson5910):

no, it's just an assumption since this problem is missing that critical piece of info

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

so #3

jimthompson5910 (jim_thompson5910):

no

OpenStudy (anonymous):

2

jimthompson5910 (jim_thompson5910):

yes

OpenStudy (anonymous):

ohhh ok i kinda get it lol

OpenStudy (anonymous):

can you look at another 1

jimthompson5910 (jim_thompson5910):

sure

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