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Joshuam1
 one year ago
Triangle UVW is the preimage of triangle RST with a scale factor of 3. Find the area of triangle UVW if the area of triangle RST is 9 cm2.
81 cm2
27 cm2
18 cm2
9 cm2
Joshuam1
 one year ago
Triangle UVW is the preimage of triangle RST with a scale factor of 3. Find the area of triangle UVW if the area of triangle RST is 9 cm2. 81 cm2 27 cm2 18 cm2 9 cm2

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srossd
 one year ago
Best ResponseYou've already chosen the best response.1An intuitive way to think about this is that area is the square of distance. So, when you scale the distances of the sides by 3, the area scales by 9. So, 9 cm2 becomes 81 cm2.

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0wow that was simple O_O

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0I have some similar questions. Think you can have a look?

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0Quadrilateral HIJK is the preimage of quadrilateral LMNO. Find the scale factor, t.

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0the options are 9/4 , 5/3, 9/25, 3/2

srossd
 one year ago
Best ResponseYou've already chosen the best response.1So, 375/135 = 2.77ish. You know from the last question that that's the square of the scale factor. Square root it and you get 1.66ish. So, 5/3.

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0okay i have another I'm just working out what you said so i can have it for myself

srossd
 one year ago
Best ResponseYou've already chosen the best response.1Okay, let me know if you have any questions.

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0Find WZ if the area of trapezoid ABCD is 225 cm2, the area of trapezoid WXYZ is 81 cm2, and AD is 35 cm.

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.021 cm 12.6 cm 58.3 cm 97.2 cm

srossd
 one year ago
Best ResponseYou've already chosen the best response.1So, find the scale factor first, like I did in the last question.

srossd
 one year ago
Best ResponseYou've already chosen the best response.1Not quite, you forgot to take the square root.

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0find the sqrt of 2.77?

srossd
 one year ago
Best ResponseYou've already chosen the best response.1Right, 225/81=2.77, but that's the ratio of the areas. To turn that into the ratio of lengths, you need the square root.

srossd
 one year ago
Best ResponseYou've already chosen the best response.1Right, so now use that to find WZ.

srossd
 one year ago
Best ResponseYou've already chosen the best response.1Right, so WZ = 21. Good job!

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0:D sweet 2 more questions

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0Find the area of the preimage rectangle QRST if the area of the image rectangle DEFG is 54 cm^2 and the scale factor is 3/2

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0216 cm^2 108 cm^2 54 cm^2 24 cm^2

srossd
 one year ago
Best ResponseYou've already chosen the best response.1Well, with those choices, it's pretty obvious. It has to be less than 54. But still, try and work it out.

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0okay :D what is the first step?

srossd
 one year ago
Best ResponseYou've already chosen the best response.1Square the scale factor,s ince you're working with area.

srossd
 one year ago
Best ResponseYou've already chosen the best response.1Right. Now, you're going from post image to preimage, so you have to divide by that.

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0sorry no i divded 54 and 3/2

srossd
 one year ago
Best ResponseYou've already chosen the best response.1You need to divide by the squared ratio, since you're dealing with area.

Joshuam1
 one year ago
Best ResponseYou've already chosen the best response.0ty for all your help I am done :D
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