<p>In the figure, \(\angle ADC = 90{}^\circ\), \(\angle ACD = 42{}^\circ\), \(AD = 6.5\) cm, \(AB = 13.5\) cm.</p>
<div class="content-block"><figure class="question-figure aligncenter" style="text-align: center;"><img src="https://vocwkpgapvksartxhhor.supabase.co/storage/v1/object/public/question-images/pasted/1767421189006-4kt9bmpclkr.png" style="max-width: min(300px, 100%); height: auto; display: block;" alt="A diagram containing a right-angled triangle ACD and triangle ABC sharing vertex A and line segment BCD." class="aligncenter custom-width" /></figure></div>
<p>Find</p>
<ol class="i-list"><li><div class="list-item-content"><span class="list-item-text">the length of \(CD\),</span></div></li><li><div class="list-item-content"><span class="list-item-text">the length of \(BC\),</span></div></li><li><div class="list-item-content"><span class="list-item-text">the area of triangle \(ABC\).</span></div></li></ol>

In the figure, \(\angle ADC = 90{}^\circ\), \(\angle ACD = 42{}^\circ\), \(AD = 6.5\) cm, \(AB = 13.5\) cm.

The Cosine Code: Unlocking the Mystery of Side $x$

The Cosine Code: Unlocking the Mystery of Side $x$

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