dedderick 2 years ago In the triangle, x = 3. Find y.

1. dedderick

2. mathsmind

have you studied Pythagoras theorem

3. mathsmind

?

4. dedderick

no not yet

5. mathsmind

ok you want to solve this using sin and cos

6. mathsmind

you should have done it right?

7. itsmeeQUENNIE

@dedderick the formula for pythagoran theorem is |dw:1360070556954:dw|

8. mathsmind

you can use the sin rule or the cos rule

9. dedderick

ok

10. dedderick

how which side to square

11. dedderick

i meant what side do we square

12. mathsmind

i will give you the answer and then prove it for you

13. dedderick

then i can understand it better

14. mathsmind

if x =3 in your case then y=$3\sqrt{2}$

15. mathsmind

now you should know that $\sin 45 = \cos 45=\frac{ 1 }{ \sqrt{2} }$

16. dedderick

right

17. Nataliecowell

In any right triangle, you can use the Pythagorean Therom to solve for sides. In that triangle, x is 2 of the sides and equals 3. Pyhtagreons Therom is a^2+b^2=c^2 A and b are the x's in the diagram. So 3^2 + 3^2 is equal to 18= c^2 Then find the square root of 18 to solve.

18. mathsmind

do you agree with that rule

19. dedderick

yes i understand now

20. mathsmind

the guy says he hasn't done Pythagoras theorem

21. mathsmind

so we had to go to a different ulternative

22. dedderick

ok