#geometry
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...to know if there are other ways to solve it, we need to know the way you solved it.
If CD is the altitude, then use the altitude rule:
Part of Hyp/alt = alt / other part hyp
BD is part of the hyp, and DA is the other part:
AD/6.72 = 6.72/BD
BD is the second leg opf triangle BCD with D as the right angle: BD = squareroot(24^2 - 6.72^2)
AD = 6.72^2 / squareroot(24^2 - 6.72^2) = 1.96
You found BD