← math: geometry concepts you don't know will reappear later
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new term
sector
a sector is a fraction of the area of a circle. it is a “slice of the pie.” to find the area of a sector, you can set up a proportion of sector area/entire area to central angle/360.
example: what is the length of arc st if the radius of the circle is 3? remember area is π r2 , so the area of the circle is 9/8π.
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