Pollard Lowe
10/20/2024 · Primary School

Q1. Knowledge/Undersatnding \( \quad / 5 \) marks i) \( \mathrm{K}=\quad / 3 \) marks If \( \cos \theta=-\frac{1}{4} \quad \) Angle \( \theta \) is a principal angle that lies in quadrant 2 such that \( 0^{\circ} \leq \theta \leq 360^{\circ} \). i) Find the exact values of \( x, y \), and r . ii)Find the principal angle \( \theta \) and the related acute angle \( \beta \) to the nearest degree.

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- \( x = -\frac{1}{4} \) - \( y = \frac{\sqrt{15}}{4} \) - \( r = 1 \) - \( \theta \approx 108^\circ \) - \( \beta \approx 75^\circ \)

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