dedderick
In the triangle, x = 3. Find y.
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dedderick
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mathsmind
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have you studied Pythagoras theorem
mathsmind
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?
dedderick
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no not yet
mathsmind
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ok you want to solve this using sin and cos
mathsmind
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you should have done it right?
itsmeeQUENNIE
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@dedderick the formula for pythagoran theorem is |dw:1360070556954:dw|
mathsmind
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you can use the sin rule or the cos rule
dedderick
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ok
dedderick
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how which side to square
dedderick
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i meant what side do we square
mathsmind
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i will give you the answer and then prove it for you
dedderick
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then i can understand it better
mathsmind
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if x =3 in your case then y=\[3\sqrt{2}\]
mathsmind
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now you should know that \[\sin 45 = \cos 45=\frac{ 1 }{ \sqrt{2} }\]
dedderick
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right
Nataliecowell
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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.
mathsmind
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do you agree with that rule
dedderick
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yes i understand now
mathsmind
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the guy says he hasn't done Pythagoras theorem
mathsmind
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so we had to go to a different ulternative
dedderick
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ok