2000 AMC 12竞赛试题/第10题
Problem
The point
is reflected in the
-plane, then its image
is rotated by
about the
-axis to produce
, and finally,
is translated by 5 units in the positive-
direction to produce
. What are the coordinates of
?
![]()
Solution
Step 1: Reflect in the xy plane. Replace z with its additive inverse: ![]()
Step 2: Rotate around x-axis 180 degrees. Replace y and z with their respective additive inverses. ![]()
Step 3: Translate 5 units in positive-y direction. Replace y with y+5. ![]()
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