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Triangle XYZ has vertices X(1, –1), Y(3, 4), and Z(5, –1). Nikko rotated the triangle 90° counterclockwise about the origin. What is the correct set of image points for triangle X’Y’Z’?
 

 

 

Here are the answers

A, X’(1, 1), Y’(-4, 3), Z’(1, 5)

B, X’(1, 1), Y’(–3, –4), Z’(–1, –5)

C, X’(–1, 1), Y’(–3, –4), Z’(–5, 1)

D, X’(–1, –1), Y’(4, –3), Z’(–1, –5)

 Feb 19, 2021
 #1
avatar+117978 
+2

90°  counter-clockwise rotation rule     x, y   →   -y  ,  x

 

So

 

(1,  -1)  →   ( 1, 1)  = X'

(3 ,4)   →    (-4, 3)  = Y'

(5,  -1) →    ( 1  , 5) = Z'

 

 

cool cool cool

 Feb 19, 2021
 #2
avatar+27 
+2

Thanks

Aphmau  Feb 19, 2021

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