Question

Geometry Help?

Answer 1

@jim_thompson5910

Answer 2

@saifoo.khan Help?

Answer 3

what does CPCT stand for

Answer 4

Corresponding parts of congruent triangles are congruent

Answer 5

i mean Corresponding parts of congruent triangles

Answer 6

so in that last box, they are saying that those two angles are congruent because of CPCT, which means what must have been proven right beforehand?

Answer 7

http://www.calculus.org/

Answer 8

Yes

Answer 9

yes what?

Answer 10

Lol i mean yes, something must have proven beforehand, but i have no idea what

Answer 11

well if you're saying that the corresponding angles are congruent because the triangles are congruent, what must be true

Answer 12

the triangles are congruent? all angles and sides are the same?

Answer 13

does it say anywhere that the two triangles are congruent

Answer 14

lol no....
they aren't

Answer 15

but yet you use CPCT, so what must have been proven

Answer 16

that those two angles are equal? Im lost sorry

Answer 17

another name for equal is ???

Answer 18

esp when you're talking about triangles (or any geometric figure)

Answer 19

congruent?

Answer 20

good, so this rules out choices B and C

Answer 21

because we need to show that they are congruent (not similar)

Answer 22

Its A?

Answer 23

why do you say that

Answer 24

because we figured out an angle already

Answer 25

O wait but they are sharing the hypotonuse

Answer 26

So I guess that would mean D

Answer 27

choice A says its using the SAS rule, but do you have 2 pairs of congruent sides?

Answer 28

Well we have one pair, but not another

Answer 29

so we can't use the SAS rule, that eliminates choice A

Answer 30

So then it would have to be D

Answer 31

but luckily we can use the HL rule because we have the 2 hypotenuses congruent (they are same line) and we have 2 legs congruent (the two radii)

Answer 32

so that leads to D

Answer 33

OK Thank you!

Answer 34

np