## anonymous one year ago If a and b are two sides of a right triangle, find the length of the hypotenuse, c. a=8, b=4, c=?

1. anonymous

so do you know the formula?

2. anonymous

a^2 + B^2=c^2

3. anonymous

heck no

4. anonymous

oh

5. anonymous

8^2+4^2=c^2 youll want to $\sqrt{c}$

6. anonymous

do whaa

7. anonymous

so just plug a and b in and then you take the square root of c

8. anonymous

how do you do that

9. anonymous

so 80?

10. pooja195

This is called the Pythagorean theorem $\huge~\rm~a^2+b^2=c^2$ |dw:1439387408714:dw| $\huge~\rm~8^2+4^2=c^2$ $\huge~\rm~64+16=c$

11. pooja195

Once you find 64+16 just square root it

12. anonymous

yes then you take the square root of that

13. anonymous

i dont know how to square root haha that is why i need help

14. pooja195

whats 64+16?

15. anonymous

$8^2+4^2=c^2\ or \sqrt{80}$

16. pooja195

right you might need to use a calc for that when you do you get a decimal $\huge~\rm~8.944272$

17. pooja195

From there just take the first 3 numbers

18. pooja195

19. anonymous

or you could simplify 80.

20. anonymous

so 9?

21. pooja195

$$\color{#0cbb34}{\text{Originally Posted by}}$$ @pooja195 so about 8.94 $$\color{#0cbb34}{\text{End of Quote}}$$ this

22. anonymous

guys this is a multiple choice and the answers aern't numbers like that

23. anonymous

$\sqrt{16+5}=4\sqrt{5}$

24. anonymous

25. pooja195

@kylefoster58 it would help if u put the answer choices

26. anonymous

sorry haha

27. lfreeman1285

Here you use the Pythagorean theorem which is a^2 + b^2 = c^2 a and b are the legs of the triangle while c is the hypotenuse. All you have to do is fill in the variables and solve for c. Therefore, (8)^2 + (4)^2 = c^2 64 + 16 = 80 But because 80 is c^2, you have to square root it. $\sqrt{80}$ = $4\sqrt{5}$ and that's your final answer.

28. pooja195

^thats right

29. anonymous

its D.

30. anonymous

4 square root of 5 right

31. anonymous

thank yall again!!