In triangle ( A B C, m angle A=(6 x+9)^{circ}, m angle B=(x-8)^{circ} ), and the exterior angle at ( C ) is ( 141^{circ} ). What is the measure of angle ( B ) ? ( 129^{circ} ) ( 141^{circ} ) ( 12^{circ} ) ( 20^{circ} )
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In triangle \(ABC\), we have angles \(A\), \(B\), and \(C\). The problem gives us the measures of angles \(A\) and \(B\) in terms of \(x\) and tells us the exterior angle at \(C\) is \(141^{\circ}\). Show more…
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