<p>In the diagram, \(\angle BAC=54{}^\circ \), \(AB=4.2\) cm, \(AC=3.6\) cm, \(CD=5.5\) cm and \(AD=8\) 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/1767409263479-z9vcqjz0nd.png" style="max-width: min(250px, 100%); height: auto; display: block;" alt="Diagram of two connected triangles ABC and ACD" class="aligncenter custom-width" /></figure></div>
<p>Calculate</p>
<ol class="i-list"><li><div class="list-item-content"><span class="list-item-text">the area of \(\Delta ABC\), correct to \(3\) significant figures,</span></div></li><li><div class="list-item-content"><span class="list-item-text">\(\angle ACD\), correct to \(1\) decimal place.</span></div></li></ol>

In the diagram, \(\angle BAC=54{}^\circ \), \(AB=4.2\) cm, \(AC=3.6\) cm, \(CD=5.5\) cm and \(AD=8\) cm.

the area of \(\Delta ABC\), correct to \(3\) significant figures,

\(\angle ACD\), correct to \(1\) decimal place.

Advanced Euclidean Geometry: The Cosine Rule Challenge

Advanced Euclidean Geometry: The Cosine Rule Challenge

Video Solution: