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use one rotation to map quadrilateral ABCD to the other quadrilateral so to map this one to this one right over here use a number between 0 and 360 degrees to describe the angle counterclockwise is positive so you're going to want to move it counterclockwise to try to get it to map there and the only option they give us because they want us to do it with one rotation is the rotation tool and so we have to think about what do we want to rotate around what point and if we put it right over here it looks like this point Point a does correspond to this point right over here so if we were to rotate this around if we were to rotate this around not 90 but it looks like 180 degrees around this point Point a would show up over here it feels like point let's see is that right is that right or let's actually just try it out point a would show up over no no that's not right that doesn't seem to let's try it out because if we rotated 180 degrees oh actually I was right it did it did match up and that's why that's this is interesting it tested a test your visual aid visualization two skills so it did actually match up and what I did is I put that point of rotation exactly between those points but because it looked like 180 degrees around this point so rotation by 180 degrees about negative one negative one so the 10th center of rotation is negative one negative one the angle of rotation is 180 degrees Point a maps to this point right over here so point a maps to the point 1 negative 1 1 negative 1 and Point C Point C which is diagonally opposite point a maps to this point right over here which is 6 negative 6 6 negative 6 6 negative 6 and we got it right