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Thread: solving a triangle >.<

  1. February 7th 2010, 12:12 AM #1
    sherwin156
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    solving a triangle >.<

    1.A regular pentagon is inscribed in a circle whose radius 18cm. Find the perimeter of the pentagon.

    2.Find the radius of the circle circumscribed about the triangle for which A=50deg. B=15deg a=70cm
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  2. February 7th 2010, 02:12 AM #2
    Solarmew
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    <br /> \frac{360}{5} = 72^{\circ} \therefore \angle O = 72^{\circ}<br />

    find the missing side using the law of cosine and you'll find the perimeter
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