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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- Feb 7th 2010, 12:12 AMsherwin156solving 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 - Feb 7th 2010, 02:12 AMSolarmew
$\displaystyle

\frac{360}{5} = 72^{\circ} \therefore \angle O = 72^{\circ}

$

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