# Would a trig expert please help?

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**1**la vache fantôme

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**Would a trig expert please help?**

Im trying to figure out these stupid inverse functions in trig. I know Soh Cah Toa. And im good with that but now its stuff where instead of being given the value of your angle (theta) and the value of one length and you find the rest. Its 2 lengths and you find the angle.

So heres the problem:

A cable 4m long is attached to a pole. This cable is staked to the ground 1.75m from the base of the pole. Find the angle that the cable makes with the ground.

I used the bottom left angle as my theta. I think its the Sin -1 function i have to use since sin is opposite over hypotenuse.

So what i thought to so was Sin -1( 1.75 divided by 4

I came up with 25.94 (rounded slightly)

/ |

4 / |

/ | 1.75

/ |

/ |

/_______|

Can somebody tell me if this is right or not?

So heres the problem:

A cable 4m long is attached to a pole. This cable is staked to the ground 1.75m from the base of the pole. Find the angle that the cable makes with the ground.

I used the bottom left angle as my theta. I think its the Sin -1 function i have to use since sin is opposite over hypotenuse.

So what i thought to so was Sin -1( 1.75 divided by 4

I came up with 25.94 (rounded slightly)

/ |

4 / |

/ | 1.75

/ |

/ |

/_______|

Can somebody tell me if this is right or not?

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**3**la vache fantôme

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Soh Cah Toa?

**S**means Sin. and oh menas**o**pposite over**h**yp**C**osin and the ah means**a**djacent over**h**yp**T**angent means**o**pposite over**a**djacent
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**5**la vache fantôme

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do you get 25.94 when rounded to the nearest hundred?

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**6**la vache fantôme

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Soh Cah Toa is what every teacher except this one ***** teaches. For hte intro and the trig class

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**7**la vache fantôme

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well in geometry class part of the cericulum is intro to trig. Its supposed to be just 4 days. bUt the teacher i have is the biggest math geek ever and is qualified to teach every math course this school offers. He teaches AP stat and trig, and that is what he is more happy with so instead of 4 days we spend 4 weeks

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Originally Posted by

**MERTON**what's intro?

Intro.

Phantom is going to intro his boot to Merton's butt.

Intro.

PS: Calc and higher maths are easy if you're solid with algebra and trig

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**9**la vache fantôme

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yea yea i know. IM actually doing well in trig. I enjoy it a hell of a lot more than proofs!

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for those who don't know, curly hair notation = pubic short-hand.

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**11**Chronic Tai Shan

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Some Old Horse Caught Another Horse Taking Oats Away

a/sinA = b/sinB = c/sinC, where A is an angle, and a is side of triangle opposite angle A, and so on.

Works for any triangle.

a/sinA = b/sinB = c/sinC, where A is an angle, and a is side of triangle opposite angle A, and so on.

Works for any triangle.

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Originally Posted by

**phantomcow2**Im trying to figure out these stupid inverse functions in trig. I know Soh Cah Toa. And im good with that but now its stuff where instead of being given the value of your angle (theta) and the value of one length and you find the rest. Its 2 lengths and you find the angle.

So heres the problem:

A cable 4m long is attached to a pole. This cable is staked to the ground 1.75m from the base of the pole. Find the angle that the cable makes with the ground.

I used the bottom left angle as my theta. I think its the Sin -1 function i have to use since sin is opposite over hypotenuse.

So what i thought to so was Sin -1( 1.75 divided by 4

I came up with 25.94 (rounded slightly)

/ |

4 / |

/ | 1.75

/ |

/ |

/_______|

Can somebody tell me if this is right or not?

So heres the problem:

A cable 4m long is attached to a pole. This cable is staked to the ground 1.75m from the base of the pole. Find the angle that the cable makes with the ground.

I used the bottom left angle as my theta. I think its the Sin -1 function i have to use since sin is opposite over hypotenuse.

So what i thought to so was Sin -1( 1.75 divided by 4

I came up with 25.94 (rounded slightly)

/ |

4 / |

/ | 1.75

/ |

/ |

/_______|

Can somebody tell me if this is right or not?

what you actually found was the angle the cable makes the pole. in the picture, you drew 1.75m as the height of the pole, instead of the distance from the stake to the base of the pole. which might have confused you. the answer you found is right for the picture you drew. however, since 1.75 is the base of the triagle...what you're looking for is cos^-1(1.75/4) which should give you ~64.06 deg.

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Originally Posted by

**phantomcow2**Im trying to figure out these stupid inverse functions in trig. I know Soh Cah Toa. And im good with that but now its stuff where instead of being given the value of your angle (theta) and the value of one length and you find the rest. Its 2 lengths and you find the angle.

So heres the problem:

A cable 4m long is attached to a pole. This cable is staked to the ground 1.75m from the base of the pole. Find the angle that the cable makes with the ground.

I used the bottom left angle as my theta. I think its the Sin -1 function i have to use since sin is opposite over hypotenuse.

So what i thought to so was Sin -1( 1.75 divided by 4

I came up with 25.94 (rounded slightly)

/ |

4 / |

/ | 1.75

/ |

/ |

/_______|

Can somebody tell me if this is right or not?

So heres the problem:

A cable 4m long is attached to a pole. This cable is staked to the ground 1.75m from the base of the pole. Find the angle that the cable makes with the ground.

I used the bottom left angle as my theta. I think its the Sin -1 function i have to use since sin is opposite over hypotenuse.

So what i thought to so was Sin -1( 1.75 divided by 4

I came up with 25.94 (rounded slightly)

/ |

4 / |

/ | 1.75

/ |

/ |

/_______|

Can somebody tell me if this is right or not?

cos theta = 1.75/4

theta = cos^-1 (1.75/4)

Punch that into your calculator and you're done.

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We'll easily solve this problem for you.

Go to paint. Draw out the diagram. Save as jpeg. Upload to any webspace and reference it here.

Go to paint. Draw out the diagram. Save as jpeg. Upload to any webspace and reference it here.

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Originally Posted by

**phantomcow2**So heres the problem:

A cable 4m long is attached to a pole. This cable is staked to the ground 1.75m from the base of the pole. Find the angle that the cable makes with the ground.

I used the bottom left angle as my theta. I think its the Sin -1 function i have to use since sin is opposite over hypotenuse.

So what i thought to so was Sin -1( 1.75 divided by 4

I came up with 25.94 (rounded slightly)

/ |

4 / |

/ | 1.75

/ |

/ |

/_______|

Can somebody tell me if this is right or not?

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**16**Chronic Tai Shan

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Originally Posted by

**MERTON**you can see the pic just fine if you click on his quote button.

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Originally Posted by

**ofofhy**The problem is that the diagram in his original post does not match the wording of the problem. It should be like the attached. Anthonaut and apple_quit are right.