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Math Help - Grade 8 Geometry

  1. #1
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    Grade 8 Geometry

    Hii!

    I'm a bit stuck on this problem which I have. It tells us to find the angle marked x . I tried my best to copy this diagram into paint, so it seems close to the real drawing to me.



    Thanks!!

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  2. #2
    Super Member Quacky's Avatar
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    Re: Grade 8 Geometry

    We have a square, two equilateral triangles and an isosceles triangle. Focus on working out the largest angle in the isosceles triangle. You can do this using the facts that:
    -Angles at a point sum 360^o
    -Angles in an equilateral triangle are all 60^o
    -Angles in a square are all 90^o

    Once you've worked out the largest angle in the isosceles triangle, use the facts that the other two angles in the triangle are equal and that all angles in any triangle sum 180^o.
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  3. #3
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    Re: Grade 8 Geometry

    Quote Originally Posted by JesseElFantasma View Post
    Hii!

    I'm a bit stuck on this problem which I have. It tells us to find the angle marked x . I tried my best to copy this diagram into paint, so it seems close to the real drawing to me.



    Thanks!!

    What is the size of the angles in a square? What is the size of the angles in an equilateral triangle?
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  4. #4
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    Re: Grade 8 Geometry

    Thanks! This helped alot.
    So from what you said I drew the conclusion of:

    360^o - (90^o + 60^o + 60^o )<br />
= 360^o - 210^o<br />
= 150^o<br /> <br />
180^o - 150^o<br />
= 30^o<br /> <br />
30^o / 2<br />
= 15^o<br /> <br />
x= 15^o
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  5. #5
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    Re: Grade 8 Geometry

    Thanks! This helped alot.
    So from what you said I drew the conclusion of:

    360^o - (90^o + 60^o + 60^o )= 360^o - 210^o= 150^o...................180^o - 150^o = 30^o........................30^o/ 2....= 15^o................x= 15^o
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  6. #6
    Super Member Quacky's Avatar
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    Re: Grade 8 Geometry

    Perfect.
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