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P (3, 4) when reflected in X axis is P'(3, -4)
Equation of line PP' is x = 3
∴ image of O(0, 0) in the line PP' is O'(6, 0)
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OM = 3 units
MP = 4 units
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In right angled ΔOMP
OP2=OM2+MP2
=32+42
=25
⇒OP=√25=5
Similarly, the other sides of the quadrilateral are also of 5 units.
∴ Perimeter of POP'O' = 5 × 4 = 20 units
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