Perhatikan perhitungan berikut.

Ingat, panjang busur lingkaran:

<img align="middle" alt="begin mathsize 14px style Panjang space busur equals fraction numerator alpha over denominator 360 degree end fraction times 2 pi r end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mi»Panjang«/mi»«mo»§#160;«/mo»«mi»busur«/mi»«mo»=«/mo»«mfrac»«mi»§#945;«/mi»«mrow»«mn»360«/mn»«mo»§#176;«/mo»«/mrow»«/mfrac»«mo»§#183;«/mo»«mn»2«/mn»«mi»§#960;«/mi»«mi»r«/mi»«/mrow»«/mstyle»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />

Maka:

<img align="middle" alt="begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell Panjang space busur end cell equals cell fraction numerator alpha over denominator 360 degree end fraction times 2 pi r end cell row blank equals cell fraction numerator 320 degree over denominator 360 degree end fraction times 2 times 22 over 7 times 14 end cell row blank equals cell 8 over 9 times 2 times 22 times 2 end cell row blank equals cell fraction numerator 8 times 88 over denominator 9 end fraction end cell row blank equals cell 704 over 9 end cell row blank equals cell 78 comma 22 space cm end cell end table end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd»«mi»Panjang«/mi»«mo»§#160;«/mo»«mi»busur«/mi»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mi»§#945;«/mi»«mrow»«mn»360«/mn»«mo»§#176;«/mo»«/mrow»«/mfrac»«mo»§#183;«/mo»«mn»2«/mn»«mi»§#960;«/mi»«mi»r«/mi»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mrow»«mn»320«/mn»«mo»§#176;«/mo»«/mrow»«mrow»«mn»360«/mn»«mo»§#176;«/mo»«/mrow»«/mfrac»«mo»§#183;«/mo»«mn»2«/mn»«mo»§#183;«/mo»«mfrac»«mn»22«/mn»«mn»7«/mn»«/mfrac»«mo»§#183;«/mo»«mn»14«/mn»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mn»8«/mn»«mn»9«/mn»«/mfrac»«mo»§#183;«/mo»«mn»2«/mn»«mo»§#183;«/mo»«mn»22«/mn»«mo»§#183;«/mo»«mn»2«/mn»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mrow»«mn»8«/mn»«mo»§#183;«/mo»«mn»88«/mn»«/mrow»«mn»9«/mn»«/mfrac»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mn»704«/mn»«mn»9«/mn»«/mfrac»«/mtd»«/mtr»«mtr»«mtd/»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»78«/mn»«mo»,«/mo»«mn»22«/mn»«mo»§#160;«/mo»«mi»cm«/mi»«/mtd»«/mtr»«/mtable»«/mstyle»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />

Jadi, panjang busur&nbsp;<img align="middle" alt="begin mathsize 14px style AB end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mi»AB«/mi»«/mstyle»«/math»" role="math" src="data:image/svg+xml;base64,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" style="max-width: none;" />&nbsp;adalah&nbsp;<img align="middle" alt="begin mathsize 14px style 78 comma 22 space cm end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mn»78«/mn»«mo»,«/mo»«mn»22«/mn»«mo»§#160;«/mo»«mi»cm«/mi»«/mstyle»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />.

Hitunglah panjang busur&nbsp;<img align="middle" alt="begin mathsize 14px style AB end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mi»AB«/mi»«/mstyle»«/math»" height="17" role="math" src="data:image/svg+xml;base64,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" style="max-width: none; vertical-align: -4px;" width="20" />&nbsp;dengan jari-jari lingkaran&nbsp;<img align="middle" alt="begin mathsize 14px style 14 space cm end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mn»14«/mn»«mo»§#160;«/mo»«mi»cm«/mi»«/mrow»«/mstyle»«/math»" height="18" role="math" src="data:image/svg+xml;base64,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" style="max-width: none; vertical-align: -4px;" width="40" />, jika besar sudut pusat&nbsp;<img align="middle" alt="begin mathsize 14px style AOB end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mi»AOB«/mi»«/mstyle»«/math»" height="17" role="math" src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOndycz0iaHR0cDovL3d3dy53aXJpcy5jb20veG1sL21hdGhtbC1leHRlbnNpb24iIGhlaWdodD0iMTciIHdpZHRoPSIzMSIgd3JzOmJhc2VsaW5lPSIxMyI+PCEtLU1hdGhNTDogPG1hdGggeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzE5OTgvTWF0aC9NYXRoTUwiPjxtc3R5bGUgbWF0aHNpemU9IjE0cHgiPjxtaT5BT0I8L21pPjwvbXN0eWxlPjwvbWF0aD4tLT48ZGVmcz48c3R5bGUgdHlwZT0idGV4dC9jc3MiLz48L2RlZnM+PHRleHQgZm9udC1mYW1pbHk9IkFyaWFsIiBmb250LXNpemU9IjE0IiB0ZXh0LWFuY2hvcj0ibWlkZGxlIiB4PSIxNS41IiB5PSIxMyI+QU9CPC90ZXh0Pjwvc3ZnPg==" style="max-width: none; vertical-align: -4px;" width="31" />:

d.&nbsp;<img align="middle" alt="begin mathsize 14px style 320 degree end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mn»320«/mn»«mo»§#176;«/mo»«/mrow»«/mstyle»«/math»" height="18" role="math" src="data:image/svg+xml;base64,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" style="max-width: none; vertical-align: -4px;" width="32" />

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