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Math Help - To find the value angle

  1. #1
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    To find the value angle

    What is the value of the shaded angle in shape A?. Please find attachemet to get shade.
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  2. #2
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    Angles in a circle add up to 360^{\circ}.
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  3. #3
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    For B:
    All angles at a point add to 360. Assuming all sides are equal, B is divided into 4 equal parts.

    \frac{360^{\circ}}{4} = 90^{\circ}

    The rest of them are similar.
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