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Geometry Review:
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Basic Concepts of Shapes
While the Egyptians and Babylonians
demonstrated knowledge about
geometry, the Greeks created the
first formal mathematics of any kind
by organizing geometry with rules of
logic.
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Click here to learn about more math history.
Geometry is a fundamental part of
mathematics. The word “geometry”
the
0011 0010comes
1010 1101 from
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1011Greek words geo
meaning “earth” and metrein
meaning “to measure.”
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Who Uses Geometry?
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Architects
Astronomers
Designers: Aeronautical, Graphics, etc.
Surveyors
Coast Guard
And many many more!
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Basic Properties of Shapes
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• Polygon - an object with many sides.
Ex. Triangle, Rectangle, Pentagon, etc.
• All squares are rectangles, but not all
rectangles are squares.
• Triangles are rectangles cut diagonally
in half.
• The interior angles of a polygon is 360º.
• The interior angles of a triangle is 180º.
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Perimeter and Circumference
x
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P = Y +Y + X+X
=2Y + 2X
• The perimeter (P)
of a polygon is the
sum of the side
lengths.
• The Circumference
(C) is the distance
around a circle.
C = 2r = d
• To the left are
some examples.
Y
r = radius
d = diameter
Y
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Area of an Object
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• The area (A) of a
rectangle is found by
multiplying the length
(l) by the height (h).
A = l h
• The area of a triangle is
half of a rectangle.
A=½ lh
• The area of a circle is
A =   r2
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A = 75 = 35
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A = ½45 = 10
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A =   22 = 4 
Now Let’s Take The Quiz!
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Click here to take the Quiz.