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Math Help - Angle made by the chords on the circle.

  1. #1
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    Angle made by the chords on the circle.

    Can you please tell me the answers then explain to me how you got this.

    By the way, just put in all the angles you can see.

    Tangent at the bottom by the way
    Attached Thumbnails Attached Thumbnails Angle made by the chords on the circle.-z0up0.png  
    Last edited by mr fantastic; November 18th 2011 at 08:04 PM. Reason: Re-titled.
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    Re: Can you please tell me these angles?

    That's not how things work here. If you show some effort, you might get some help...
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    Re: Can you please tell me these angles?

    Okay, sorry. I've tried to work it out and here's what I got :

    Is this correct?

    90 because it's a right angle.
    65 and 25 for the tip of the triangle 'cos that's a 90.
    65 and 25 for the angles at the tangent 'cos that's 90 too.

    Is this correct? If so, could you please help me some of the other angles.
    If not, please explain, I really need help.

    Thanks!
    Attached Thumbnails Attached Thumbnails Angle made by the chords on the circle.-sx9cg.png  
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    Re: Can you please tell me these angles?

    Quote Originally Posted by Kyleee View Post
    Okay, sorry. I've tried to work it out and here's what I got :

    Is this correct?

    90 because it's a right angle.
    65 and 25 for the tip of the triangle 'cos that's a 90.
    65 and 25 for the angles at the tangent 'cos that's 90 too.

    Is this correct? If so, could you please help me some of the other angles.
    If not, please explain, I really need help.

    Thanks!
    You are correct that the angle made by the chords on the circle is a right angle, so 25 degrees is correct.

    I don't know where you're getting the idea that the angle on the inside is a right angle though. It can't possibly be...
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    Re: Can you please tell me these angles?

    I don't understand the two angles at the tangent, please help. The ones at the tangent are the ones I need the most!

    You're really helpful!
    Last edited by mr fantastic; November 18th 2011 at 08:00 PM. Reason: Deleted link to another question begging for help.
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    Re: Can you please tell me these angles?

    Quote Originally Posted by Kyleee View Post
    Also, after you've helped me with this, can you please help with question 2 on this; I don't have a clue!
    If you don't have a clue, then not much we can do: this isn't a classroom.
    WHAT did your teacher teach you: nothing?
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    Re: Can you please tell me these angles?

    Hello Kaylee,
    You should label your diagrams.Every angle in your diagram can be described in terms of arcs. You do not have to give values if there is insufficient info.Be sure to show all givens
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    Re: Can you please tell me these angles?

    You are going wrong.

    First off, are u sure that the angle in the center is REALLY at the center of the circle?

    If YES, then how in heavens name are the two angles in the triangle (apart from y) not equal? They MUST be equal. You have shown one as 65 and the other as 25. Not possible.

    Here's a clue. Angle y will be equal to 2x as per the rule, "angle at center is twice the angle at circumference." But again, that applies ONLY if the angle y is really at the center.
    Attached Thumbnails Attached Thumbnails Angle made by the chords on the circle.-sx9cg.png  
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    Re: Can you please tell me these angles?

    Quote Originally Posted by cosmonavt View Post
    You are going wrong.

    First off, are u sure that the angle in the center is REALLY at the center of the circle?

    If YES, then how in heavens name are the two angles in the triangle (apart from y) not equal? They MUST be equal. You have shown one as 65 and the other as 25. Not possible.

    Here's a clue. Angle y will be equal to 2x as per the rule, "angle at center is twice the angle at circumference." But again, that applies ONLY if the angle y is really at the center.
    The angles at the diameter are not at the center but they can be described in terms of arcs
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  10. #10
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    Re: Can you please tell me these angles?

    Well, I'm 99% sure the vertical line is a diameter line,
    this diameter line being hypotenuse of an isosceles right triangle, so 2 angles of 45 degrees;
    leaves one triangle at 45-65-70, the other at 45,25,110.
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