1. anonymous

|dw:1438618911654:dw|

2. anonymous

What is the area of the circle

3. anonymous

$A=\pi r ^{2}$

4. anonymous

radius is half of the length of the circle

5. anonymous

do you know the length of BD

6. anonymous

if you do, take half of that and that is the radius

7. anonymous

no i dont can u help?

8. anonymous

@triciaal

9. anonymous

what's 32?

10. anonymous

length os arch abc is 32?

11. anonymous

yea

12. anonymous

if lenght of ABC is 32, the circunference perimenter is 320 because 36° = 1/10 of 360° $320 = 2.r.\pi$ $r = \frac{160}{\pi}$$A=\pi(\frac {160}{\pi})^{2}$

13. anonymous

$A = \frac {25600} {\pi}$