Question

On a circle of radius 10 feet, what angle would subtend an arc of length 1 feet?

Answer 1

We have this formula :
\[l=R\theta \]
Where :
\[l~:~\text{the length of the arc }\\\theta~:~\text{the angle in radian }\\R~:~\text{the radius }
\]
So :
\[\theta=\frac{l}R=\frac{1}{10}=0.1\text{rd}\]
And you can convert it to degrees if you want !

Answer 2

how?

Answer 3

I do not remember learning this

Answer 4

You know that :
\[180^\circ =\pi\text{rd}\]
So :
\[1\text{rd}=\frac{1}{\pi}180^\circ\]
So :
\[0.1\text{ rd}=0.1\times180^\circ\div\pi\approx 5.73^\circ\]

Answer 5

what is r and what is d?

Answer 6

rd means radian

Answer 7

oh