## anonymous one year ago Fan and medal :)

1. anonymous

What is the length of the unknown side of the right triangle? A right triangle with hypotenuse x and legs 21 and 20 21 29 400 441

2. Astrophysics

Use the pythagorean theorem as before

3. Astrophysics

Now you set it up

4. anonymous

can i see the formula again?

5. Astrophysics

\[a^2+b^2=c^2\]

6. anonymous

so in the Pythagorean Theorem, \[a ^{2}+b ^{2}=c ^{2}\] where the a and b represent the legs of the triangle, and c is the hypotenuse

7. anonymous

21^2+20^2=

8. anonymous

correct

9. Astrophysics

Yes good! so you have \[21^2+20^2 = x^2\]

10. Astrophysics

Keep going :)

11. anonymous

ok 21*21 right?

12. anonymous

yes, do 21*21, and 20*20

13. anonymous

14. Astrophysics

Yup

15. anonymous

16. anonymous

kk 441+400=

17. Astrophysics

Good, keep going

18. anonymous

then, you must find the square root of that "part of the answer"

19. anonymous

so find the square root of 841

20. anonymous

ok 29? XD

21. Astrophysics

Ok well since you said square root already haha, I will show you why exactly we take the square root, via algebra. |dw:1438607451660:dw| when you take the square root we have a positive and negative answer but you don't need to really worry about that, that's the algebra behind it.

22. Astrophysics

Yes, 29

23. anonymous

29 is correct

24. anonymous

thx