A skating path on a circular rink subtends an angle of at the centre and is long

MATHEMATICS · Subjective · A Level · Mathematics · Trigonometry · Trigonometry

Problem

A skating path on a circular rink subtends an angle of

2.4\,\text{rad}

at the centre and is

18\,\text{m}

long. Determine the radius of the rink, correct to one decimal place.