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Intro to Geometry
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Angles
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Classifying Triangles
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Classifying Quadrilaterals
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Polygons & Symmetry
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Congruent & Similar Figures
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What extends without end in two opposite directions?
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A line
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How do I write the name of this? CD
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CD OR DC
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How do I write the name of this? A B
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BA
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A B C EG Name 2 lines that are parallel
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AC EG CA GE OR and
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What type of lines are these?
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Parallel lines
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Name this 3 different ways J K L
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JKL LKJ K
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What is the approximate measurement of the following angle? a.60° b.95° c.140°
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The angle is approximately 60°, because we know it is an acute angle, because it is less than 90°
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Use estimation to name the angle whose measure is closest to the given measure: a. 90 ° b. 15 ° c. 135 ° M N O P Q R
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a. ORM b. PRQ c. PRM
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J K L M N O Name 2 obtuse angles from the following diagram
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KON MOJ
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What angles are 90°? A B C D EF
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CFA AND CFE
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What type of triangle is this ?
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Equilateral triangle ~All three sides have the same length
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What type of triangle is this ?
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Isosceles triangle ~Two sides that are the same length
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What type of triangle is this ? 6 in. 10 in. 2 in.
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Scalene triangle ~All three sides are different lengths
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What type of triangle is this? 45°
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Right triangle ~A triangle with 1 right angle
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Find the measurement of the missing angle, x 100° 15° x°
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100° + 15° = 115° 180° - 115° = 65° X = 65°
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What quadrilateral has 2 pairs of parallel sides AND 4 right angles?
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A rectangle
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What quadrilateral has 2 pairs of parallel sides, 4 right angles, and all 4 sides are the same length?
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A square
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What quadrilateral has 2 pairs of parallel sides and 4 sides that are all the same length?
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A rhombus
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True or false…. All squares are parallelograms
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True All squares have 2 pairs of parallel sides
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Which sides of this quadrilateral are parallel? A BC D
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AD BC and
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What is the name of the following figure?
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A regular pentagon ~A pentagon is a five-sided closed polygon
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Is the following figure a regular hexagon or an irregular hexagon?
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Irregular hexagon ~All the sides are not the same length, and all of the angles are not the same measurement.
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Classify the following polygon, and tell whether it is regular or irregular.
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Regular octagon ~An octagon is an eight-sided closed polygon. This specific octagon has sides of all equal length, and angles are all equal measurement.
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How many lines of symmetry does this figure have?
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This figure has 1 line of symmetry
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How many diagonals can be drawn from one vertex of this figure? How many triangles can be formed by these diagonals?
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~3 diagonals can be drawn from 1 vertex ~4 triangles are formed from these diagonals 1 2 3 4
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6 in. 8 in. 16 in. 12 in. Are these triangles similar or congruent?
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These triangles are similar triangles They are the same shape, but a different size
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The following triangles are congruent. What is the value of x and y? 15 in. 12 in. x 14 in. 33° y°y°
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Since the triangles are congruent, they have the same exact measurements. So x = 14 in. y = 33°
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A BC D ABD and ADC are congruent. How long is CD? 31 m 20 m 45°
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CD is 31 meters ~Since both triangles are congruent, CD will have the same measurement as BD.
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A B C D E F ABC and DEF are congruent. List the corresponding angles.
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The corresponding angles are: AD B E CF and
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Are these triangles similar or congruent? Why? 20 in. 10 in. 5 in.
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These quadrilaterals are similar, because they have the same shape, but not the same size.
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