In given Fig. the length PB = 4cm. Solution:
The lenght of AB = 8cm (using Pythagoras). $\text{And}\ \text{AB}=2\text{PB}$
$\frac{\text{AB}}{2}=\text{PB}$
$\frac{8}{2}=\text{PB}$
$\text{PB}= 4\text{cm}.$
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