Final Review

Question 1

ratio

Answer 1

a comparison of two quantities by means of division

Question 2

proportion

Answer 2

an equation of ratios

Question 3

similar polygons

Answer 3

sides which correspond are proportional, angles are equal

Question 4

scale factor

Answer 4

the factor by which side lengths are multiplied

Question 5

midsegment

Answer 5

a segment that joins the midpoints of two sides of a triangle

Question 6

median

Answer 6

a segment from a vertex to the midpoint of the opposite side

Question 7

geometric mean

Answer 7

the geometric mean of two positive quantities a and b is x such that a/x=x/b

Question 8

pythagorean triple

Answer 8

three integers which form the sides of a right triangle

Question 9

circle

Answer 9

the set of all points equidistant from a give point in the same plane

Question 10

disc

Answer 10

the union of a circle and its interior

Question 11

radius

Answer 11

distance from center to a point on the circle

Question 12

chord

Answer 12

a segment that joins two points on a circle

Question 13

diameter

Answer 13

a chord that passes through the center of the circle

Question 14

circumference

Answer 14

the total distance around a circle

Question 15

pi

Answer 15

the ratio of circumference to diameter

Question 16

central angle

Answer 16

an angle whose vertex is the center of the circle

Question 17

minor arc

Answer 17

an arc that measures less than half a circle

Question 18

major arc

Answer 18

an arc that measures more than a half circle

Question 19

semicircle

Answer 19

a half circle

Question 20

inscribed angle

Answer 20

anangle whose sides are chords of a given circle

Question 21

inscribed polygon

Answer 21

a polygon whose sides are chords

Question 22

circumscribed polygon

Answer 22

each side is tangent to the circle

Question 23

circle tangent

Answer 23

a line is tangent to a circle when they are coplanar and intersect at precisely one point

Question 24

point of tangency

Answer 24

the point of intersection of a tangent line and a circle

Question 25

area

Answer 25

the number of unit squares needed to cover the area

Question 26

center of a regular polygon

Answer 26

the point in the interior of a regular polygon that is equidistant from the sides

Question 27

apothem

Answer 27

segment from center to side, perpendicular to that side

Question 28

circumradius

Answer 28

segment from center to vertex