Question

Can someone help please

Answer 1

`3 \: radians`

Step-by-step explanation

The formula for the calculating the length of an arc is

`l = r \theta`

where theta is in radians.

From the diagram

`l = 12cm`

`r = 4cm`

We substitute the values to obtain;

`4\theta = 12`

Divide both sides by 4 to get;

`\theta = (12)/(4)`

`\theta = 3 \: radians`