exam Maths Puzzle Numerical Ability

QR is the arc of a circle with center P. If the length of arc QR is 6pi what is the area of sector PQR

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I need to solve this to its simplified form, can you help please?

x + 1 _ x - 4 = 1 - x
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The second angle of a triangle is 18 degrees more than twice the first. The third angle is three times as large as the second. How large are the angles?