Classwork:
page 19: Notation. Read: Zero degrees is less than theta (Greek letter/variable) theta is less than 180 degrees. The notation reads: Rotation about the point C of theta degrees of C = C' (C prime). I dont' like the double C here, continue to next picture.
Page 23. Here, this notation is better. First off, to find the angle of rotation, put your pencil and the center of rotation - in this example, point D and pick a point on the pre-image (the first image - the given image) and draw a ray from the center of rotation through the chosen point (ray DA). Find the corresponding point on the rotated image (A'B'C'D') and draw ray (DA'). your angle of rotation is angle ADA'. Measure the angle with a protractor. The notation reads: Rotation around point D, clockwise (the negative sign also can mean opposite) 75 degrees of figure ABCD which results in figure A'B'C'D'.
Finally, page 25. How to find the center of rotation given two figures (pre-image and image - look for the prime marks). The directions are right there for you. This just needs more practice. Follow the directions.
HOMEWORK: H.W.P.S Lesson 2, page 27 - 30, #'s 1 - 2, 6 - 10.
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