## anonymous one year ago Picture in comments Please help!!! Triangle ABC is circumscribed about circle O. Find the perimeter of the triangle ABC. A. 50 units B. 45 units C. 40 units D. 21 units

1. anonymous

2. anonymous

Use pythag to find the hypotnenuse as in the drawing|dw:1436368997582:dw|

3. anonymous

so $10^{2}+11^{2}=c ^{2}$

4. anonymous

Wait, I just saw that 4 down there so... $15^{2}+14^{2}=c ^{2}$

5. anonymous

@nananea1998 do you know how to do that?

6. anonymous

that would mean 29^2 right? cuz 15+14=29 and its squared

7. anonymous

@ANA789

8. anonymous

$225+196=c ^{2}$ $\sqrt{c}=\sqrt{429}$ $c=20.51$

9. anonymous

15^2 is 225 and 14^2 is 196 so you add those two together and take the square root when you find the sum

10. anonymous

Do you see what I did and how I got there?

11. anonymous

@ANA789 Yes

12. anonymous

Okay so do you have answer choices?

13. anonymous

A. 50 units B. 45 units C. 40 units D. 21 units So it'd be D. 21 because it rounds it up?

14. anonymous

@ANA789

15. anonymous

Does the question say to round it up or does it want an exact value?

16. anonymous

@ANA789 It doesn't say to round it up but I don't have an answer choice that has a decimal at all

17. anonymous

Your answer is going to be 50 units because when you round up 20.51, it goes to 21, therefore 21+14+15=50 units

18. anonymous

@ANA789 Oh okay ^^ Thank you!!

19. anonymous

Anytime @nananea1998 :)