anonymous
  • anonymous
Pre algebra questions <~< ~Is actually trying and needs help~
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Triangle PQR is transformed to triangle P'Q'R'. Triangle PQR has vertices P(3, −6), Q(0, 9), and R(−3, 0). Triangle P'Q'R' has vertices P'(1, −2), Q'(0, 3), and R'(−1, 0). Plot triangles PQR and P'Q'R' on your own coordinate grid. Part A: What is the scale factor of the dilation that transforms triangle PQR to triangle P'Q'R'? Explain your answer. (4 points) Part B: Write the coordinates of triangle P"Q"R" obtained after P'Q'R' is reflected about the y-axis. (4 points) Part C: Are the two triangles PQR and P''Q''R'' congruent? Explain your answer. Part c: They must be similar but because of dilation they cant be congruent.
anonymous
  • anonymous
Part B: NO IDEA. Part A: I really don't know what they're asking here o-o
Loser66
  • Loser66
|dw:1444602056939:dw|

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Loser66
  • Loser66
|dw:1444602255247:dw|
anonymous
  • anonymous
I can't see the rest of the word omo
Loser66
  • Loser66
You can see the scale is 1/3, since Q (0,9) goes to Q' (0,3) P (3,-6) goes to P' (1,-2) |dw:1444602422134:dw|
Loser66
  • Loser66
same as R (-3,0) goes to R' (-1,0) 1/3 R = R'
Loser66
  • Loser66
for B, just change the x-coordinate of the points from positive to negative. like P' ( 1,-2), after reflecting about y axis, it becomes (-1,-2) . That is it. Do the same with Q', R'
Loser66
  • Loser66
for C, they are congruent.
anonymous
  • anonymous
B: Q'= (0,3) R'= (-1, 0) P'= (-1, -2) < making sure I got that right.
Loser66
  • Loser66
|dw:1444602858155:dw|
anonymous
  • anonymous
Ohhh so everything is opposite
Loser66
  • Loser66
|dw:1444602881824:dw|
Loser66
  • Loser66
just x-coordinate, not y
Loser66
  • Loser66
|dw:1444602937126:dw|
Loser66
  • Loser66
|dw:1444602959886:dw|
Loser66
  • Loser66
|dw:1444602984942:dw|
Loser66
  • Loser66
|dw:1444603008578:dw|
anonymous
  • anonymous
because 0 is a positive and a negative ( aka it can't be negative.)
Loser66
  • Loser66
ok
anonymous
  • anonymous
Part A: 1/3 Q (0,9) goes to Q' (0,3) P (3,-6) goes to P' (1,-2) Part B: r' = (1,0) P'= (-1, -2) Q'= (0,3) Part C: They are congruent.
Loser66
  • Loser66
answer for a ) is " the scale of dilation is 1/3"
anonymous
  • anonymous
Ok xD
anonymous
  • anonymous
It says to explain why they're congruent, I thought congruent meant same shape and same size that's why your answer is confusing me.
Loser66
  • Loser66
One of the theorem of congruence is SSS, right? your triangle P'Q' R' after rotating about y axis, its sides do not change its length. right? You fold a triangle by a paper, then you rotate it, or move it to other place, its sides stay, right? the triangle is itself still., right?
anonymous
  • anonymous
Ohhh ok
anonymous
  • anonymous
I have one more question if you wouldn't mind?
Loser66
  • Loser66
have to see it first/
anonymous
  • anonymous
In the figure shown, line AB is parallel to line CD. What is the measure of angle x? Explain your answer. https://gyazo.com/05c4085b802f264b814f774b986d2be0
anonymous
  • anonymous
I tried adding them but I got 185... now I'm stumped.
anonymous
  • anonymous
Maybe I should subtract them and see what 180- x =?

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