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yes @geny55 ?
is this a pretest?
Perimeter is the distance around the 2d shape, so |dw:1433638990215:dw| add all the numbers for the perimeter and the area of a rectangle is just length x width\[Area = l \times w\] once you have that you can multiply both of them by 7.5.
so i do 6+6+8+8? @Astrophysics
Yes that's the perimeter
But you must multiply it by 7.5 for the scale factor
i got 210
Sounds good, now find the area
Read what I've said above
whats the area?
No that's the perimeter, the area of a rectangle is length multiplied by the width.
and whats the length and width
You should really know this by now, |dw:1433640168475:dw| Note that the scale factor for area, the change in area is equal to the scale factor squared, which means the scale factor for area is \[7.5^2\]
so its 6 x 8
That's for the unscaled rectangle, yes.
so thats the length x width
ok so whats the area
I feel as if you're ignoring everything I've said
im not I'm learning :) @Astrophysics
i got d
am i right? @Astrophysics
How did you get the area?
area = 6 x 8 6 x 7.5= 45 8 x 7.5= 60 is that right? @Astrophysics
Not quite, nice try though. Remember what I said to note earlier: `Note that the scale factor for area, the change in area is equal to the scale factor squared, which means the scale factor for area is`\[7.5^2\]
\[area = l \times w \times 7.5^2\]
i got 2,700