Question

What are the dimensions of a rectangle of 12*10 inches, if resized to 1/8th the area (15 square inches) and scaled proportionally?

Answer 1

the area is 120. if we scale that to 1/8 we get:

120/8 = 60/4 = 30/2 = 15

1,15; 3,5 are the factors of 15.

Id take a gander and say 3 and 5; but that s just a guess really....

Answer 2

A 3 x 5 would proportionally be a 6 x 10

Answer 3

blex, area is proportional, not side length.

for example:

2*4 = 8 lets scale the side by 3

6*12 = 72 but the area is not 8(3) = 24...not 72

Answer 4

What about when you have two similar triangles? You take the corresponding sides and make them proportional to the other sides... don't you?

Answer 5

if you want to scale "sides" then yes; but if you want to scale "area" then no.... because area does not scale in the same manner as sides. but I think I see a point you are making...

if we want the sides to stay proportional as well, then then we should not restrict our answers to "intergers" alone....

Answer 6

That's what I am thinking...

Answer 7

then we might want to setup a few equation to help keep things "in order ":)

Answer 8

My real question is what, let what be x, times itself multiplied by 1.2, will yield 15. So 3*5 does equal 15, but 5 is not 1.2(3). Solve for x if x(1.2x)=15. That's my question.

Answer 9

12(x) * 10(x) = 15 would that be a good equation?

Answer 10

this would factor each side proportionally and get us an area of 15... i think

Answer 11

120x^2 = 15

x^2 = 15/120 = 5/40 = 1/8

x^2 = 1/8

x = sqrt(1/8)

Answer 12

The area of the original rectangle is given as 12*10, i.e 12 is the length and 10 is the width. So, the smaller rectangle should also have the length and width proportional to 12:10 and area 15 sq.inches

Answer 13

12*sqrt(8)/8 = side "a"

10*sqrt(8)/8 = side "b"

Answer 14

x*1.2x = 15or x^2 = 15/1.2 or x = sqrt(15/1.2)

Answer 15

i.e length = 4.24 and width = 3.53

Answer 16

4.2426406871192851464050661726291

and

3.5355339059327376220042218105242

so its the same either way ;)

Answer 17

I think the dimensions of the rectangle would be [sqrt{18}] * 5/[sqrt{2}].
Just divide both - length and breadth by [sqrt{8}]. Here sqrt means a squareroot

Answer 18

wpg; that is correct.

Answer 19

I know. It was not any complicated. I've joined openstudy.com just now.. Looks great place.