Question
In given Figure, the length $PB =$ _____________ cm .
✓
Answer
$
\begin{array}{rlrl}
OA^2 =OP^2+AP^2 \\
\Rightarrow 5^2 =3^2+AP^2 \\
\Rightarrow AP^2 =25-9 \\
\Rightarrow AP^2 =16 \\
\Rightarrow AP =4 cm \\
\Rightarrow AB =2 AP \\
\Rightarrow AB =2 \times 4 \\
AB =8 cm
\end{array}
$
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