5C: Reflections
Flashcard
•
Mathematics
•
8th Grade
•
Practice Problem
•
Hard
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10 questions
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1.
FLASHCARD QUESTION
Front
What is a reflection?
Back
When you flip or mirror an object across a line.
Answer explanation
A reflection is when a figure is flipped or mirrored across a particular line.
Tags
CCSS.8.G.A.3
CCSS.HSG.CO.A.5
2.
FLASHCARD QUESTION
Front
What axis is the triangle being reflected over?
Back
Y-axis
Answer explanation
Think of your axis of reflection as a book spine: If you "turn the page" to move your figure from preimage to image, where would the page have been attached?
In this case, the y-axis.
Tags
CCSS.8.G.A.3
CCSS.HSG.CO.A.5
3.
FLASHCARD QUESTION
Front
What axis is the image reflected over? Options: X-axis, Y-axis
Back
X-axis
Answer explanation
Think of your axis of reflection as a book spine: If you "turn the page" to move your figure from preimage to image, where would the page have been attached?
In this case, the x-axis.
Tags
CCSS.8.G.A.3
CCSS.HSG.CO.A.5
4.
FLASHCARD QUESTION
Front
Reflections over the x-axis change the ____-__________.
Back
y-coordinate
Answer explanation
If you compare the points in the visual example, you can see that the x-values are the same but the sign of the y-value was changed.
Therefore, reflecting over the x-axis changes the y-coordinate.
Tags
CCSS.8.G.A.3
CCSS.HSG.CO.A.5
5.
FLASHCARD QUESTION
Front
Coordinates of point K after reflection over the x-axis?
Back
(-5, 2)
Answer explanation
Think of your axis of reflection as a book spine: If you "turn the page" to transform your figure, with the page attached to the x-axis, where does point K' end up?
(-5,2) on the other side of the x-axis
Tags
CCSS.8.G.A.3
CCSS.HSG.CO.A.5
6.
FLASHCARD QUESTION
Front
Which answer shows a reflection across the x-axis? Options: a, b, c, d
Back
c
Answer explanation
Figure A shows a reflection across the line y=x.
Figure B shows a rotation.
Figure C shows a reflection across the x-axis.
Figure D Shows a reflection across the y-axis.
Tags
CCSS.8.G.A.3
CCSS.HSG.CO.A.5
7.
FLASHCARD QUESTION
Front
Identify the transformation from ABC to A'B'C'.
Back
Reflection across the x-axis
Answer explanation
The image appears to be flipped from the preimage, which indicates a reflection.
The figure would need to be flipped/reflected across the x-axis to be oriented the way it is. Think of it like a page turned from preimage to image, with the page "attached" at the x-axis.
Tags
CCSS.HSG.CO.A.2
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