Geometry is all around us!

1. Geometry
In Our World
By: Cassidy Sullivan
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2. Obtuse Angle (Lesson 3)
Definition- An angle that
measures greater than
90° but less than 180°
By the Linear Pair Theorem, the
obtuse angle shown is
supplementary to the acute
angle above it.
This picture is of a railing on a walkway at my grandparents apartment
complex. The angle of the railing follows that of the stairs.
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3. Regular Hexagon (Lesson 15)
Definition- A six sided
polygon that is both
equiangular and equilateral.
This is a light fixture above
the vanity in the bathroom of
my dad’s house. It’s shape is
just for decorative purposes.
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4. Right Angle (Lesson 3)
Definition-An angle that
measures exactly 90°
Here, I took a picture of the
corner of my room where
the walls and ceiling come
together. If this were not a
right angle, the house would
not stand properly.
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5. Pythagorean Theorem and Area
Did you know that the
area of an HD TV is
actually smaller than a
regular TV with the same
dimensions?
This is a picture of the new
HD TV in the living room.
Click here to see why!
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6. Perpendicular Bisector (Lab 3)
Definition- a segment
that is perpendicular to
another segment and
divides it into two
congruent parts.
This is the window in my
bedroom. Its proportions
allow it to be opened and
closed.
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7. Isosceles Trapezoid (Lesson 69)
Definition- a trapezoid ( a
quadrilateral with one pair
of parallel lines) in which
the legs are congruent
This is an old Christmas
ornament that is currently
hanging my sister's and my
room. It’s shape is also for
decoration.
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8. Theorem 5-3 (Lesson 27)
By Theorem 5-3, because
line C is perpendicular to
A line A and lines A and B
are parallel, line C is also
B
perpendicular to line B.
C
This is my bureau. Theorem
5-3 works to ensure that all
the drawers can open and
close easily.
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9. Skew Lines (Lesson 5)
Definition-lines that are
not coplanar. They are
not parallel, but they
will never intersect.
Skew lines exist on this
suitcase because it is a
three dimensional object
with multiple faces or
planes.
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10. Center of a Circle (Lesson 23)
Definition-the point inside
a circle that is equidistant
from every point on the
circle
The center on this CD
allows it to fit into and be
played within a radio.
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11. Theorem 43-2 (Lesson 43)
According to this theorem,
because the pink diameter
bisects chord AB, and chord
AB is not a diameter, it is
perpendicular to chord AB.
The line pattern of this drain
allows water to pass through, but
keeps out larger items and debris.
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12. Diagonal of a Polygon (Lesson 15)
Definition- a segment
connecting any two
nonconsecutive vertices
of a polygon.
This is a piece of construction
of the soon to be Buddhist
temple in Raynham. The
diagonal bars add support vto
the structure.
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13. Squares (Lesson 19)
Definition- a quadrilateral
with four congruent sides
and four right angles.
The perpendicular ribbon
pattern on this picture board
create squares that easily
hold rectangular pictures and
cards.
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14. Equilateral Triangles (Lesson 13)
Definition- A triangle with
three congruent sides. It
also has three congruent
angle measures.
This will become the front piece of
the Buddhist Chapel in Raynham.
The shape is easy to support and
incorporate into the construction.
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15. Radius of a Circle (Lesson 23)
Definition- a segment
whose endpoints are the
center of a circle and a
point on the circle; also the
length of that segment.
The radii here keep the items
stored on this stand separated.
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16. Parallelograms (Lesson 19)
Definition- a
quadrilateral with two
pairs of parallel sides.
Properties
1. The opposite angles
are congruent.
2. The consecutive
angles are supplementary.
3. The opposite sides are
This is a close up of my microwave. congruent.
The parallelogram is a simple 4. The diagonals bisect
design. each other.
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17. Isosceles Triangle (Lesson 13)
Definition- A triangle
with at least two
congruent sides. It’s
base angles are also
congruent.
This is the roof of my
grandparents apartment. The
shape allows snow and rain to
run off the sides of the roof
rather than pool on top.
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18. Octagon (Lesson 15)
Definition- an eight sided
polyhedron. This octagon
is irregular because not all
the side lengths are
equal.
The shape of the panes of
glass on this chandelier are
for decorative purposes rather
than to effect the light.
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19. Triangular Prism (Lesson 49)
Definition- A polyhedron
formed by two congruent
triangular bases
connected by lateral faces
that are parallelograms.
This shape allows for items
to sit solidly on the shelf in
the shower.
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20. Sphere (Lesson 49)
Definition- the set of points
in space that are a fixed
distance from a given
point (called the center)
This sphere is able to roll and bounce
around because of its shape.
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21. Acute Angles (Lesson 3)
Definition- an angle that
measures greater than
0º, but less than 90º
This star, like most, is made out
of alternating acute and obtuse
angles. The acute angle shown
forms a linear pair with the
This star is located on the side of
obtuse angle to its right or left.
a storage box in my bedroom.
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22. Bibliography
 All vocabulary terms were found in the Saxon Geometry Textbook.
(Saxon Geometry. Austin, TX: Saxon, 2009. Print.)
 The basis for Slide 5, Pythagorean Theorem and Area, was donated by
my father, Patrick Sullivan.
 All photos are original and were taken in and around my homes.
 Programs utilized in presentation: Microsoft PowerPoint 2010,
Microsoft Word 2010, Paint, and MediaFire.
nk Y ou!
Tha
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