Question

Peter reflected parallelogram ABCD across the y-axis. If angle A is 115° and angle B is 65°, what is the degree measurement of angle A'?

Answer 1

65°
50°
115°
180°

Answer 2

Also 115 degrees, because in a line reflection, angle measurement in perserved.

Answer 3

oh ok

Answer 4

Parallelism is also perserved, as well as some other characteristics.

Answer 5

ok

Answer 6

You're welcome.

Answer 7

thank you! i have another question

Answer 8

If triangle MNO is congruent to triangle PQR, which statement is not true?

Answer 9

a. MN ≅ QP
b. ∠ N ≅ ∠ Q
c. NO≅ QR
d. ∠ O ≅ ∠ R

Answer 10

@Easyaspi314

Answer 11

Where's your diagram?

Answer 12

Wasnt given one

Answer 13

Sorry, I cant help you.

Answer 14

is there one you would guess?

Answer 15

I'm not going to second-guess.

Answer 16

I just drew two triangle MNO and PQR that are congruent to each other, but all 4 choices are all true. See what I mean?

Answer 17

thats what i thought as well

Answer 18

Now I can draw two triangle, MNO and PQR, that are congruent, and not all 4 choices are true. Thats why I am saying, I cannot guess what your teacher had in mind. I am not a prophet.

Answer 19

you are to me.

Answer 20

This is mathematics. Not a guessing game.

Answer 21

I assumeyou copied the entire question and choices 100% correctly.

Answer 22

haha tell my teacher that.... alright one more

Answer 23

Justin wrote the following indirect proof:
Prove: 7 is a factor of 91.

Step 1: Assume that 7 is a factor of 91.

Step 2: 91 divided by 7 is 13.

Step 3: A factor is an integer by which another integer is divisible.

Step 4: Therefore, 7 must be a factor of 91.

Which step in Justin's proof is incorrect?

Answer 24

You can post any other questions in a new post. Let anyone jump in. I'm leaving.

Answer 25

I'll answer this very quickly. As I have to leave for a while.

Answer 26

ok. thanks for the help

Answer 27

ok :)

Answer 28

If you want to prove something "by indirect proof", you must first assume the negation. So Step #1, should be "Assume that 7 is NOT a factor of 91."

Answer 29

And BTW, after you assume the negation, you prove that the negation is not true. So you have a contradiction, And therefore, you're assumption is void. Hence, 7 must be a factor of 91.

(Either 7 is a factor of 91 or 7 is not a factor of 91. If you assume that 7 is not a factor of 91, and you prove that false, then the only conclusion you can mae is that 7 IS a factor of 91.

Makes sense?

Answer 30

yes thank you! :)

Answer 31

You're welcome.