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measure of an arc
an arc's measure (in degrees) is he measure of its central angle

minor arc
an arc whose measurement is between 0180 degrees. Named with 2 letters

Major arc
measurement between 180360 degrees. Named with 3 letters

semicircle
an arc with 180 degrees. Named with 3 letters


length of an arc
m of arc/360 = l of arc/circumference


area of a sector
m/360 = area of setor/area of circle

concentric circles
circles with the same center


lateral area
LA= Ceircumference x height

Surface area
 SA= LA + 2B
 or diameter x height x pi


