## anonymous one year ago What is the length of line segment ED?

1. anonymous

2. anonymous

i think you can do the Pythagorean theorem, you know what im talking about ?

3. anonymous

a^2 + B^2=c^2?

4. anonymous

5. anonymous

is this multiple choice or no ?

6. anonymous

You cannot, since it is not a right triangle

7. anonymous

no its not multiple choice it just asks me What is the length of line segment ED?

8. anonymous

its a triangle inside of a circle

9. anonymous

10. anonymous

if DF is a diameter then it is aright angled triangle.

11. anonymous

by the picture it looks like it is the diameter

12. anonymous

yeah i think its the diameter

13. anonymous

i just have no clue how to solve this thing

14. jdoe0001

as @surjithayer said, that is, Thales' theorem -> http://www.mathopenref.com/thalestheorem.html

15. jdoe0001

so.. since it's a right triangle knock yourself out with the "pyghatorean theorem" :)

16. anonymous

i did and i got 7,835?

17. anonymous

mmm I got something else

18. anonymous

@mcfizzy321 i did and it was blank

19. anonymous

wait is it 62.5?

20. anonymous

i'm kinda in the middle of a test so...could someone just tell me the answer please?

21. anonymous

i got 63.

22. jdoe0001

|dw:1437179218568:dw| $$\bf \textit{pythagorean theorem}=c^2=a^2+b^2\implies c^2-b^2=a^2\\ \quad \\\implies \sqrt{c^2-b^2}=a \\ \quad \\ \qquad \begin{cases} c=65\\ b=60 \end{cases}\implies \sqrt{65^2-60^2}=a$$

23. anonymous

jk wrong thing

24. anonymous

63 was wrong for me

25. anonymous

do what @jdoe0001 put up

26. anonymous

i did and still got it wrong oh well

27. anonymous

i must be doing something wrong again like always

28. anonymous

i'm just going to submit this quiz

29. anonymous

im still kind of curious to know though what was the answer?

30. anonymous

$\sqrt{65^2-60^2}=\sqrt{\left( 65-60 \right)\left( 65+60 \right)}=\sqrt{5*125}=\sqrt{5*5*25}=25$