Given the dartboard of diameter  , divided into 20 congruent sectors,
, divided into 20 congruent sectors,
- The central angle is  
- The fraction of a circle taken up by one sector is  
- The area of one sector is  to the nearest tenth to the nearest tenth
The area of a circle is given by the formula

A sector of a circle is a fraction of a circle. The fraction is given by  . Where
. Where  is the angle subtended by the sector at the center of the circle.
 is the angle subtended by the sector at the center of the circle.
The formula for computing the area of a sector, given the angle at the center is

<h3>Given information</h3>
We given a circle (the dartboard) with diameter of  , divided into 20 equal(or, congruent) sectors
, divided into 20 equal(or, congruent) sectors
<h3>Part I: Finding the central angle</h3>
To find the central angle, divide  by the number of sectors. Let
 by the number of sectors. Let  denote the central angle, then
 denote the central angle, then

<h3>Part II: Find the fraction of the circle that one sector takes</h3>
The fraction of the circle that one sector takes up is found by dividing the angle a sector takes up by  . The angle has already been computed in Part I (the central angle,
. The angle has already been computed in Part I (the central angle,  ). The fraction is
). The fraction is

<h3>Part III: Find the area of one sector to the nearest tenth</h3>
The area of one sector can be gotten by multiplying the fraction gotten from Part II, with the area formula. That is

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