# Arc Length and Area of Sector

- Author:
- Hedy Lim

- Topic:
- Area

## Task 1

From the interactive below, you will see the definition of 1 radian = , when the radius = 1 unit.
That is from

## Task 2

Change the central angle into (drag the black button or type in the angle column) and the radius is still 1 unit. And observe what did you get for the arc length and area of the sector and leave it as your answer.

## Task 3

Change the central angle into and also the radius is 3 units (drag the red button to change the radius). And observe what did you get for the arc length and area of the sector and leave it as your answer.

## Task 4

Change the central angle into and also the radius is 2.4 units. And observe what did you get for the arc length and area of the sector and leave it as your answer.