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Question

# ABCD is a quadrilateral that forms A'B'C'D' when it is reflected along the y-axis. Which of the following points in the graph are wrongly marked?

A
Only A'
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B
Only D'
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C
Both A' and D'
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D
Both B' and C'
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Solution

## The correct option is C Both A' and D'Rule for reflection along y-axis: (−x , y → x , y) On reflecting the coordinates of quadrilateral ABCD across the y-axis, we get: A(-6,4) = A'(6,4) B(-2,8) = B'(2,8) C(-2,2) = C'(2,2) D(-6,0) = D'(6,0) Plotting the points on the graph, we observe: So the wrongly marked coordinates are A' and D'.

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