This document provides vocabulary terms and definitions related to geometry. It includes terms such as angle, base, circle, diameter, equilateral triangle, fractal, golden rectangle, hypotenuse, isosceles triangle, joint, kite, line of symmetry, map scale, net, obtuse triangle, pentagon, quadrilateral, radius, scalene triangle, three-dimensional, uniform crossed section, volume, width, x-axis, y-axis, and zero dimensions. For each term, it gives a definition and asks the user to provide a sentence using the term or draw an example. The purpose is to build knowledge of geometry vocabulary.

1. MEASURING HEIGHTS WITH TRIANGLES Activity 1
Vocabulary
Use this table for each given word and for those that come
across during the project. Follow an alphabetical order.
A
Word Angle
Definition or synonym The union of 2 rays that have the same
endpoint; measured in degrees or radians
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drawing
B
Word Base
Definition or synonym A side of a polygon or a face of a solid
figure by which the figure is measured or
named
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drawing

2. MEASURING HEIGHTS WITH TRIANGLES Activity 1
C
Word Circle
Definition or synonym A closed plane figure with all points of the
figure the same distance from the center
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drawing
D
Word Diameter
Definition or synonym A line segment that passes through the
center of a circle and has its endpoints on
the circle
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drawing
E

3. MEASURING HEIGHTS WITH TRIANGLES Activity 1
Word Equilateral triangle
Definition or synonym A triangle with three congruent sides
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drawing
F
Word Fractal
Definition or synonym A figure with repeating patterns containing
shapes that are like the whole but of
different sizes throughout .
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drawing
G

4. MEASURING HEIGHTS WITH TRIANGLES Activity 1
Word Golden rectangle
Definition or synonym A rectangle with a length-to-width ratio of
about 1.6 to 1
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drawing
H
Word Hypotenuse
Definition or synonym In a right triangle, the side opposite
the right angle
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drawing
I

5. MEASURING HEIGHTS WITH TRIANGLES Activity 1
Word Isosceles triangle
Definition or synonym A triangle with two congruent sides
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drawing
J
Word Joint
Definition or synonym The point where two components of a
structure join rigidly.
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drawing
K

6. MEASURING HEIGHTS WITH TRIANGLES Activity 1
Word Kite
Definition or synonym Plane shape having two sets of equal sides
and one set of opposite angles that are
equal
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drawing
L
Word Line of symmetry
Definition or synonym A line that divides a figure into
two congruent parts
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drawing
M

7. MEASURING HEIGHTS WITH TRIANGLES Activity 1
Word Map scale
Definition or synonym A ratio that compares the distance on a
map to the actual distance
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drawing
N
Word Net
Definition or synonym An arrangement of two-dimensional figures
that can be folded to make a polyhedron
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drawing
O
Word Obtuse triangle

8. MEASURING HEIGHTS WITH TRIANGLES Activity 1
Definition or synonym A triangle that has one obtuse angle
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drawing
P
Word Pentagon
Definition or synonym A polygon with five sides
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drawing
Q
Word
Quadrilateral

9. MEASURING HEIGHTS WITH TRIANGLES Activity 1
Definition or synonym A polygon with four sides
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drawing
R
Word Radius
Definition or synonym A line segment with one endpoint at the
center of a circle and the other endpoint
on the circle
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drawing
S
Word Scalene triangle

10. MEASURING HEIGHTS WITH TRIANGLES Activity 1
Definition or synonym A triangle with no congruent sides
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drawing
T
Word Three-dimensional
Definition or synonym Measured in three directions, such as
length, width, and height
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drawing
U
Word Uniform crossed section
Definition or synonym a cross-section of a solid that is the
same size and shape as its base.

11. MEASURING HEIGHTS WITH TRIANGLES Activity 1
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drawing
V
Word Volume
Definition or synonym The measure of the amount of space
a solid figure occupies
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drawing
W
Word Width
Definition or synonym Distance across from side to side.

12. MEASURING HEIGHTS WITH TRIANGLES Activity 1
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drawing
X
Word X-axis
Definition or synonym The horizontal number line on a coordinate
plane
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drawing
Y
Word Y-axis
Definition or synonym The vertical number line on a coordinate
plane

13. MEASURING HEIGHTS WITH TRIANGLES Activity 1
Use it in a sentence or
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drawing
Z
Word Zero Dimensions
Definition or synonym The property of a point that indicates no
motion is possible without leaving that
point. Formally, saying a point has
zero dimensions means that the
only vector contained on the point is
the zero vector.
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drawing