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<p>•Cos A = Sisi samping sudut A/ Sisi miring</p><p>Diketahui&nbsp;</p><p>Sisi samping sudut A(b) = 2&nbsp;</p><p>Sisi depan sudut A ( a) = √12</p><p>maka cara mencari sisi miring (c)adalah &nbsp;:</p><p>c = √(a²+b²)</p><p>c = √((√12)² + 2²)&nbsp;</p><p>c = √(12 + 4)&nbsp;</p><p>c= &nbsp;√16 &nbsp;-&gt; c= 4</p><p>mengikuti kaidah&nbsp;</p><p>Cos A = Sisi samping sudut A / Sisi miring, maka</p><p>Cos A = Sisi samping sudut A (b) / Sisi miring (c)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; / &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;4</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;/ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</p><p>&nbsp;</p><p>jadi &nbsp;nilai dari Cos A adalah 1/2 (A)&nbsp;</p><p>&nbsp;</p>