## anonymous one year ago WILL MEDAL AND FAN

1. kc_kennylau

The circumference (length of curve) of a circle is given by $$2 \pi r$$, where $$r$$ is the radius.

2. kc_kennylau

In this case, the radius is $$30 m$$.

3. kc_kennylau

$${XPY}$$ is $$\frac34$$ of the circle.

4. anonymous

So what does that mean? :l

5. kc_kennylau

The circumference (length of curve) of the whole circle is $$2\pi(30)$$ which is $$60\pi$$

6. kc_kennylau

The $$\dfrac34$$ of it would be $$\left(\dfrac34\right)60\pi$$ which would be $$45\pi$$.

7. anonymous

Oh I suspected it was that one! Thank you very much