In the diagram, \(\widehat{ABC}=\widehat{BDC}=90^\circ\).

- Write down an angle equal to \(\widehat{CBD}\).
- Given that \(AC=\quantity{10}{cm}\) and \(BC=\quantity{7}{cm}\), use similar triangles to calculate \(CD\).

In the diagram, \(\widehat{ABC}=\widehat{BDC}=90^\circ\).

- Write down an angle equal to \(\widehat{CBD}\).
- Given that \(AC=\quantity{10}{cm}\) and \(BC=\quantity{7}{cm}\), use similar triangles to calculate \(CD\).