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C2 Trig, worrying q watch

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    Need help yet again!

    Question Seven parts a and b, dunno how to start. Maybe pythagorus? Dumbfounded.

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    (Original post by rye225)
    Need help yet again!

    Question Seven parts a and b, dunno how to start. Maybe pythagorus? Dumbfounded.

    preview your post,,,no one can read the question,,
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    I just cannot read some of that question - You're causing more problems than you need to make.
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    The shaded region in the diagram shows a component for a machine, which is to be cut from a square piece of metal PQRS, of centre O and side 8cm. The outer edge of the component is the regular octagon ABCDEFGH, and the inner edge is the circle centre O and radius 3cm. Calculate:

    a) The area of the component
    b) The outer perimeter of the component

    ---

    Not actually sure how to answer it, just thought I'd help y'all out.
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    a) Split the octagon into triangles.

    OC=OF=OE and so on, and all of them equal 4. The angle in between the longest lengths = 360/8.

    Work out the area of the octagon from that and then subtract the area of the circle.

    b) Using the triangles again, because you already know the length of 2 sides and the angle in between them, you should be able to work out the length of the shortest side of the triangle, then multiply that by 4 to get the total perimeter.

    Unless I totally missunderstood the question is very likely. :p:

    P.S. please preview next time. My nose was touching the computer screen when I was reading the question.
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    Yep, it's all triangles and circles.
    • Thread Starter
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    thx man, and soz about the zoom lol
 
 
 
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