## emily9102 3 years ago help please

1. emily9102

2. Jusaquikie

so here is what we have:|dw:1351376665576:dw|

3. Jusaquikie

what we want to do is make a triangle out of that and use the Pythagorean theorem ($A^{2} +B^{2} = C^{2}$)

4. emily9102

ok, writing as you type :)

5. Jusaquikie

|dw:1351376894963:dw|

6. Jusaquikie

so A(5+10) B(4+3) is $15^{2}+8^{2}= 225+64= \sqrt{289} = 17$

7. Jusaquikie

that gives the diameter which is 2r so the radius is 8.5

8. Jusaquikie

wait it's 7 not 8 lol

9. emily9102

7.5 or just 7?

10. Jusaquikie

so that changes it to 225+49 =274

11. Jusaquikie

the square root of that is 16.55 divided by 2 is 8.276

12. emily9102

so 8.3?

13. Jusaquikie

do you see where the numbers come from?

14. emily9102

yes i was just checking. trying to write fast lol

15. Jusaquikie

it would have been neater if i didn't use 8 on the clean example lol

16. emily9102

lol yes lots of scratch now haha. so just to be sure its 8.3?

17. Jusaquikie

yes that is what it rounds to