Unit 2

Trigonometry

Investigation

Try to solve the following puzzle.

Suppose a string is laid on the radius of a circle and cut so the two are the same length. Afterwards, the string is laid along the circumference of the circle. The ends of the string are marked and used to form an angle at the centre of the circle. What is the measure of the
angle formed?



You’ll find the answer to this puzzle within this Lesson.