## Sunshine447 3 years ago In circle A shown below, mArc BC is 71° and mArc EF is 78°. http://learn.flvs.net/webdav/assessment_images/educator_geometry_v14/pool_Geom_3641_0801_03/image0044e847a03.gif What is m∡FDE?

1. Sunshine447

@CliffSedge @jim_thompson5910 @ParthKohli

2. Mikael

|dw:1346794160576:dw| Inner angle equals the aritmetic average of its supporting arcs on both sides

3. Sunshine447

okay...........

4. Mikael

Did you undestand what to compute ?

5. Sunshine447

not really...

6. Mikael

|dw:1346794316086:dw|

7. Sunshine447

so is it 78?

8. Mikael

Meant FDE of course

9. Mikael

Come on - who are the 2 supporting arcs?

10. Sunshine447

what do you mean?

11. Mikael

|dw:1346794469021:dw|

12. Mikael

(78 +71)/2

13. Sunshine447

so its 74.5?

14. Sunshine447

@Mikael is it 74.5?

15. Mikael

Y + mdl pls

16. CliffSedge

Here's a good reference: http://www.mathwarehouse.com/geometry/circle/angles-of-intersecting-chords-theorem.php

17. Sunshine447

thanks @CliffSedge

18. Sunshine447

@Mikael so it IS 74.5? I really need a final answer

19. Mikael

Plese click on Blue (ribbon)

20. Sunshine447

not until u tell me if 74.5 is correct

21. Sunshine447

i need a final answer. I posted this so i could get help, not try to learn something and then hope i get it right....

22. Mikael

(78 +71)/2 = 74.5

23. Mikael

??? ...!

24. CliffSedge

Tsk tsk tsk, how embarrassing: Begging for medals . . .