Answer:
The length of the arc AC is;

Step-by-step explanation:
Given the radius AB as 20ft.

And angle ABC measures 1 radian.
Using the Method 1;
Length of Arc AC is;

Substituting the angle in radian and the radius;

The length of Arc AC is 20 ft
Method 2;
We will firstly convert the angle from radian to degree.
As shown below;

Then we will apply the formula for calculating the length of an arc;

Substituting the value of the angle and the radius.

Therefore, the length of the arc AC is;
