According to the given question,
Let us assume that the wire which runs from the top of the pole to the point on the ground where its other end is fixed is PR and pole is represented by PQ.
In ΔPQR,
![\[\sin {{40}^{\circ }}=\frac{PQ}{PR}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-c7022190bee1ba645fafee7b985ea9a3_l3.png "Rendered by QuickLaTeX.com")
As we know, 
![\[0.6428=\frac{10}{PR}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-96b14c9e186ee738fb7504f01a9428ac_l3.png "Rendered by QuickLaTeX.com")
10. A 
