LT2018 wrote:

Any more explanations for this question?

Plz see the diag. below

As

Now the left hand triangle is a 5-12-13 triangle (Pitagorean triplet) ( it can also be dudced by pythogorus theorem as the unkown side = \sqrt{13^2 - 12^2} = 5)

Since the left part of the triangle has got the base 5, hence the base of the other triangle = 12.2 - 5 = 7.2

Now both triangles are similar ( Angle - angle -angle)

and hence the side can be deduced in the form:

\(\frac{7.2}{12}= \frac{k}{13}\)

or \(k = 7.8\)

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