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tasniahussain21
28.01.2020 •
Mathematics
Crystal is amazed! she graphed δabc using the points a(5, –1), b(3, –7), and c(6, –2). then she rotated δabc 90° counterclockwise (↺) about the origin to find δa′b′c′. meanwhile, her teammate took a different triangle (δtuv) and rotated it 90° clockwise (↻) about the origin to find δt′u′v′. amazingly, δa′b′c′ and δt′u′v′ ended up having exactly the same points! name the coordinates of the vertices of δtuv.
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Ответ:
Crystal graphed ΔABC using the following points:
On the coordinate plane, consider the point
. To rotate this point by 90° around the origin in counterclockwise direction, you can always swap the x- and y-coordinates and then multiply the new x-coordinate by -1. In a mathematical language this is as follows:
![(x,y)\rightarrow(-y,x)](/tpl/images/0476/1492/ca264.png)
Therefore, for ΔA′B′C′ we have:Since ΔA′B′C′ and ΔT′U′V′ ended up having exactly the same points, then:
On the other hand, in clockwise direction we have the following rule:
![(x,y)\rightarrow(y,-x)](/tpl/images/0476/1492/be522.png)
Therefore. we must findОтвет:
one
Step-by-step explanation: