Help with 19 Help with 20 1 If a reflection in line k follow

Help with 19

Help with 20

1 If a reflection in line k followed by a refection in line m maps point A to A\". which results in the same image as a 120 rotation about point P.then what is the value of r?

Solution

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21)
A)
this forms similar triangle
CP\'Q\' is similar to SPQ
Scale factor = (75+50)/75
                        = 125/75
                        = 5/3

P\'Q\'/PQ = 5/3
P\'Q\' / 3\'9\'\' = 5/3
P\'Q\'/(45\') = 5/3
P\'Q\' = 75\'
          = 6\'3\'\'