Final Review Flashcards
ratio
a comparison of two quantities by means of division
proportion
an equation of ratios
similar polygons
sides which correspond are proportional, angles are equal
scale factor
the factor by which side lengths are multiplied
midsegment
a segment that joins the midpoints of two sides of a triangle
median
a segment from a vertex to the midpoint of the opposite side
geometric mean
the geometric mean of two positive quantities a and b is x such that a/x=x/b
pythagorean triple
three integers which form the sides of a right triangle
circle
the set of all points equidistant from a give point in the same plane
disc
the union of a circle and its interior
radius
distance from center to a point on the circle
chord
a segment that joins two points on a circle
diameter
a chord that passes through the center of the circle
circumference
the total distance around a circle
pi
the ratio of circumference to diameter
central angle
an angle whose vertex is the center of the circle
minor arc
an arc that measures less than half a circle
major arc
an arc that measures more than a half circle
semicircle
a half circle
inscribed angle
anangle whose sides are chords of a given circle
inscribed polygon
a polygon whose sides are chords
circumscribed polygon
each side is tangent to the circle
circle tangent
a line is tangent to a circle when they are coplanar and intersect at precisely one point
point of tangency
the point of intersection of a tangent line and a circle
area
the number of unit squares needed to cover the area
center of a regular polygon
the point in the interior of a regular polygon that is equidistant from the sides
apothem
segment from center to side, perpendicular to that side
circumradius
segment from center to vertex
