E-AP01 · One sector, two changes
A proper sector has arc length \(18\) cm and complete perimeter \(42\) cm.
Find its radius and central angle.
The radius is increased by \(25\%\), with the angle unchanged. Find the new arc length and complete perimeter.
Instead, keep the original arc length but change the radius to \(8\) cm. Find the new angle and the percentage decrease in perimeter compared with the original sector.
Complete-answer checking, worked solutions and indicative written criteria.
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