Question

A student swings a 30 centimeters long ruler back and forth which is pivoted at one end on the desk. The ruler tums 135° in a swing. Assuming the arc is circular, what is the distance the tip of the ruler travels

swing(arc length)? round to the nearest hundredth. Use 3.14 for pi

Answer 1

So for circumference = 2rPi
For arc length = 2rPi x angle /360
= 2(30)(3.14) x 150/360
= 60(3.14) x 5/12
Calculator
= 78.5