hugsandkisses
When point E (9, 3) is rotated 180� about the origin, its coordinate becomes (3, 9).
True
False



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theabsurd
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false (9, 3)

hugsandkisses
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thanks hun!

theabsurd
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your welcome

shinigami1m
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how do you know its 9 3?

mathmate
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If you substitute the rotation matrix for 180 degrees, you'd get the rule
T180(x,y)=(x,y), so the rotated point should be (9,3)

theabsurd
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^know that, or you become a lazy slob like me who imagined it on the coordinate plane instead of remembering the rule. (Facepalm)

mathmate
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You have a point. But to help someone, we need something concrete to work on.

hugsandkisses
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thanks everyone!

myininaya
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I see nothing wrong with imagining it on a coordinate plane. The rule makes more since that way.

myininaya
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sense*