Question

What did I do wrong when finding out the sector area? I know the answer I got is wrong so can someone please help me

Answer 1

I believe your mistake is that you are trying to use the sector area formula ti find arc length when there is already a formula for it.
The formula for it is
$2r\pi( \frac{degree}{360} )$
So first substitute the values in and then simplify!
$2(10.5)\pi( \frac{118}{360} )$
Now simplify!
21 × 118 is 2478 so it's
$\frac{2478}{360} \pi$
When divided ou and multiplied, this is 21.62cm!