Master how to determine theta in radians when given arc length and the radius

The video tutorial explains how to calculate the angle theta in radians when given the radius and arc length. It introduces the formula theta = S/r, where S is the arc length and r is the radius. The tutorial provides examples, including converting radians to degrees by multiplying by 180/pi. The video concludes with a second example and a summary of the process.

Explain the basic definition of a radian as mentioned in the text.

Given an arc length of 15 and a radius of 3, what is the value of theta?