Sector Area in Radians

Arc Length & Area of Sector (Radian)

by Mr Wang Kangcheng

​Learning Objectives

Multiple Choice

Which formula do we use to calculate the arc length when the angle is given in radian? 

• $$r\theta$$  

• $$\frac{1}{2}r^2\theta$$  

Multiple Choice

Which formula do we use to calculate the area of the sector when the angle is given in radian? 

• $$r\theta$$  

• $$\frac{1}{2}r^2\theta$$  

Fill in the Blanks