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Determining the angle of rotation

Answer Text:
-When an object and its image is given, then to determine the angle of rotation, we need first to get the center of rotation:
-if ABC is a triangle whose image is A and the center of rotation is p then:
a)Join A to P and P to A'
b) Join B to P and P to B'
c).Join C to p and P to C'
d).Measure angle APA', BPB' and CPC'
These angles will be equal and their value is the Angle of rotation