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Geometry Review
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Quadrilaterals
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What does “Quad” mean?
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Quad means 4
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How many sides does a quadrilateral have?
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A quadrilateral has 4 sides!
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These are all quadrilaterals!
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Kinds of quadrilaterals – see if you can name them!
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p _ _ _ _ _ _ _ _ _ _
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parallelogram two sets of parallel sides
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r _ _ _ _ _ _ 3 in. 3 in. 3 in. 3 in.
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rhombus – all the sides are equal in length
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t _ _ _ _ _ _ _ _
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trapezoid – only one pair of parallel sides
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s _ _ _ _ _
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square – has right angles and ALL sides are the same length
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r _ _ _ _ _ _ _ _
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rectangle
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Other important polygons you need to know
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PENTAGON Five sides, five angles
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Hint: an octopus has 8 legs
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Eight sides, eight angles
OCTAGON Eight sides, eight angles
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Hint: Six has an X – so does the name of this shape.
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HEXAGON Six sides, six angles
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Points, Lines, and Segments
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p _ _ _ _ A
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point A
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l _ _ _ B C
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line B C
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l _ _ _ s _ _ _ _ _ _ _ K S
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line segment K S
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r _ _ S L
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ray S L
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p _ _ _ _ _ _ _ lines A B C D
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parallel lines two lines that will never cross
B C D
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i _ _ _ _ _ _ _ _ _ _ _ lines X C Y D E F R S
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intersecting lines lines that will cross if extended
Y D E F R S
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p _ _ _ _ _ _ _ _ _ _ _ _ lines F S T G
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perpendicular lines lines that cross to form right angles
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Angles
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o _ _ _ _ _ angle
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obtuse angle bigger than a right angle – more than 90 degrees
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a _ _ _ _ angles Katie Smith © 2012
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acute angles are smaller than a right angle – less than 90 degrees
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r _ _ _ _ angles
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right angles look like the letter L and are 90 degrees
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Perimeter
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Think of Jurassic Park: “Secure the Perimeter
Think of Jurassic Park: “Secure the Perimeter!” means get the fences ready!
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Perimeter = the measurement All the way around an object
Perimeter = the measurement All the way around an object *Add all the sides to find the perimeter!* 4 in. 6 in. 3 in.
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What is the perimeter of the triangle?
4 in. 6 in. 3 in.
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P=13 inches 4 in. 6 in. 3 in.
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Area
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Area is the measurement inside of an object.
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Find the area by multiplying the sides
Find the area by multiplying the sides. length x width = l x w What is the area of this rectangle? 7 in. 4 in.
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Find the area by multiplying the sides
Find the area by multiplying the sides. length x width = l x w What is the area of this rectangle? 7 in. A=28 square inches 7x4=28 4 in.
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What is the area of this square?
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What is the area of this square?
Area=25 square feet 5x5=25 5 ft.
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What is the area of this rectangle?
7 in. 3 in. 3 in. 7 in.
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What is the area of this rectangle?
7 in. Area=21 square inches 7x3=21 3 in. 3 in. 7 in.
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Types of Triangles
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Triangles can be named by the lengths of their sides.
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e _ _ _ _ _ _ _ _ _ _ triangle 3 in. 3 in. 3 in.
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equilateral triangle all the sides are equal in length
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Hint: think about an icicle
i _ _ _ _ _ _ _ _ triangle Hint: think about an icicle 10 in. 10 in.
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isosceles triangle two of the sides are equal
10 in. 10 in.
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Hint: think about the scales on a dinosaur
s _ _ _ _ _ _ triangle Hint: think about the scales on a dinosaur 4 in. 6 in. 7 in.
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scalene triangle none of the sides are the same length
4 in. 6 in. 7 in.
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3-D SHAPES
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c _ _ _ _ _ _ _
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cylinder
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c _ _ _
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cube
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s _ _ _ _ _
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sphere
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p _ _ _ _ _ _
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pyramid
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c _ _ _
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cone
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r _ _ _ _ _ _ _ _ _ _ p _ _ _ _
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rectangular prism
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t _ _ _ _ _ _ _ _ _ p _ _ _ _
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triangular prism
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Great job Mathematicians!!!
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