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1. acute angle
1a

2. an angle with a measure
greater than 0 degrees
and less than 90 degrees
1b

3. acute triangle
2a

4. triangle whose interior
angles are all acute
2b

5. adjacent angles
3a

6. angles that share a
vertex and a side but
have no interior points
in common
3b

7. alternate interior angles
4a

8. angles that lie within a
pair of lines and on
opposite sides of a
transversal
4b

9. angle
5a

10. two rays with a common
endpoint
5b

11. arc
6a

12. a curved line or segment
of a circle
6b

13. area
7a

14. the number of the
square units in a figure
7b

15. base
8a

16. the bottom side of a
geometric figure from
which the altitude or
height can be constructed
8b

17. circle
9a

18. the set of all points in a
plane that are the same
distance from a given
point
9b

19. circumference
10a

20. the distance around a
circle
10b

21. circumference
11a

22. the distance around the
edge of a circle
11b

23. complementary angle
12a

24. if the sum of two angles
measures 90 degrees
12b

25. cone
13a

26. a 3-D figure with curved
surfaces, a circular base,
and one vertex
13b

27. congruent figures
14a

28. figures that are the same
size and shape
14b

29. corresponding angles
15a

30. angles that lie on the
same side of a
transversal and in
corresponding positions
15b

31. cylinder
16a

32. a 3-D figure with ll curved
surfaces, two circular bases,
and no vertex; the net of a
cylinder is formed by two
circles and one rectangle
16b

33. decagon
17a

34. a polygon with ten sides
17b

35. diameter
18a

36. the distance across the
circle through the center
18b

37. difference
19a

38. the answer to a
subtraction problem
19b

39. dodecagon
20a

40. a 12 sided polygon
20b

41. each exterior angle of a
regular polygon
21a

42. 360 divided by (# of
sides)
21b

43. each interior angle of a
regular polygon
22a

44. 180 - (exterior angle
measure)
22b

45. edges
23a

46. the intersection of faces
of a 3-D figure
23b

47. equilateral
24a

48. means that all sides are
equal
24b

49. equilateral triangle
25a

50. a triangle with three
congruent sides
25b

51. faces
26a

52. the flat surfaces of a 3-D
figure
26b

53. height of a figure
27a

54. the perpendicular distance
from the base to the opposite
side of the figure (always
forms a right angle with the
base); also called the altitude
27b

55. heptagon
28a

56. a polygon with seven
sides
28b

57. hexagon
29a

58. a polygon with six sides
29b

59. horizontal
30a

60. lines going side to side
30b

61. intersecting lines
31a

62. two or more lines that
meet and cross at any
angle.
31b

63. isosceles triangle
32a

64. a triangle with two equal
sides, the two base
angles are also equal
32b

65. lateral area
33a

66. the sum of the areas of
the lateral surfaces (only
the sides, no bases) of a
3-D figure
33b

67. line
34a

68. a series of dots so close
together that they appear
as one continuous thing;
there is no beginning or
end to a "line".
34b

69. line segment
35a

70. two endpoints and the
straight path between
them; a "line" with a
beginning and an ending.
35b

71. measure of the interior
angles of a triangle
36a

72. 180 degrees
36b

73. net
37a

74. A two-dimensional pattern
that can be folded to make
a three-dimensional prism
or pyramid
37b

75. nonagon
38a

76. a polygon with nine
sides
38b

77. obtuse angle
39a

78. an angle that measures
greater than 90 degrees
and less than 180
degrees
39b

79. obtuse triangle
40a

80. triangle that has one
angle more than 90
degrees
40b

81. octagon
41a

82. a polygon with eight
sides
41b

83. parallel lines
42a

84. lines going in the same direction
without touching; two lines (or
line segments) with the same
slope that are always the same
distance apart.
42b

85. parallelogram
43a

86. a quadrilateral that has
both pairs of opposite
sides parallel
43b

87. pentagon
44a

88. a polygon with five sides
44b

89. perimeter
45a

90. the distance around any
closed figure
45b

91. perpendicular lines
46a

92. lines that intersect at a
right angle
46b

93. pi
47a

94. The value that shows the
relationship of a circle's
circumference to its diameter;
it has an approximate value of
3.14 or the fraction 22/7
47b

95. plane
48a

96. is a flat two-dimensional
surface that is unending
in all directions
48b

97. polygon
49a

98. a closed figure with
three or more straight
sides
49b

99. prism
50a

100. a 3-D figure that has two parallel
and congruent bases in the shape
of a polygon and at least three
lateral faces shaped like rectangles;
has a first name (after base) and
last name is prism
50b

101. product
51a

102. the answer to a
multiplication problem
51b

103. pyramid
52a

104. a solid figure that has a
polygon for a base and
triangles for sides; has a
first name (after base) and
last name is pyramid
52b

105. quadrilateral
53a

106. a polygon with four sides
53b

107. quotient
54a

108. the answer to a division
problem
54b

109. radius
55a

110. the distance from the
center of the circle to
any given point on the
circle
55b

111. ray
56a

112. a part of a line that
extends indefinitely from
one direction
56b

113. rectangle
57a

114. a quadrilateral with four
right angles; opposite
sides are parallel and
congruent
57b

115. reflex angle
58a

116. angle that measures
more than 180 degrees
and less than 360
degrees
58b

117. regular figure
59a

118. a figure in which all
sides are equal in length
and all angles are of the
same measure
59b

119. rhombus
60a

120. a parallelogram with
four equal sides
60b

121. rhombus
61a

122. has four equal sides
61b

123. right angle
62a

124. an angle that measures
90 degrees
62b

125. right triangle
63a

126. a triangle with one right
angle
63b

127. scalene triangle
64a

128. all sides are different
64b

129. solid
65a

130. a three-dimensional (3-
D) figure
65b

131. square
66a

132. a parallelogram with all
sides congruent and all
angles congruent
66b

133. straight angle
67a

134. 180 degree angle
67b

135. sum
68a

136. the answer to an
addition problem
68b

137. sum of the exterior
angles of a polygon
69a

138. ALWAYS 360 degrees
69b

139. sum of the interior
angles of a polygon
70a

140. (n-2)180 ; with n as the
number of sides in the
figure
70b

141. supplementary angle
71a

142. if the sum of two angles
measure 180 degrees
71b

143. surface area
72a

144. the sum of the areas of
all the faces and bases of
a solid figure; measured
in square units
72b

145. transversal
73a

146. a line that intersects two
or more other lines at
different points
73b

147. trapezoid
74a

148. a quadrilateral having
two sides parallel
74b

149. two ways to measure
triangles
75a

150. side length and angle
measures
75b

151. vertical
76a

152. line going up and down
76b

153. vertical angles
77a

154. angles that are opposite
from each other; formed
from two intersecting
lines
77b

155. volume
78a

156. the amount of space a 3-
D figure containes; the
number of cubic units in
a 3-D figure.
78b