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Do Now•Pull out your worksheet from yesterday for a stamp.
•In your group, choose someone to fill each role• Spokesperson• Materials gatherer• Writer• Scorekeeper
•Reminders:
• Tutoring today
• Turn in benchmark review to the basket
• Turn in Quiz corrections Wednesday
• Turn in bathroom passes for extra credit.
• Beat Ouchi High!
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CPCTC
© 2006 by Mr. Mayers
POLYGONSJUDGE
VALIDITYFORMULAS
PARALLELOGRAMS
Team 1 Team 2 Team 3 Team 4
0 0 0 0
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If ΔABC ΔDEF≅ , then which angle is congruent to C?
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F
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In a regular pentagon, each side is 31cm. What is the perimeter?
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155cm
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Find a counterexample to this statement:If a quadrilateral has all angles congruent, then it is a square.
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Rectangle
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What is the formula for the area of a trapezoid?
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A = (b1+b2) h 2
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A geometric object is congruent to itself. (AB≅AB or <C≅<C)
What is the reflexive property?
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Classify this quadrilateral
Kite
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What does CPCTC stand for?
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Corresponding Parts of Congruent Triangles are Congruent
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How many total degrees are in the interior of a hexagon? What formula did you use?
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720o, 180(n-2)
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What do all right angles have in
common?
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They are congruent, their angle measures are equal.
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Find the area of a parallelogram with base=3n and height=4mn.
12mn2
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Vertical Angles are opposite angles from where 2 lines cross.
What are vertical angles?
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List 2 properties of a parallelogram.
Both pairs of opposite sides are parallel, diagonals bisect each other, both pairs of
opposite sides are congruent, both pairs of opposite angles are congruent.
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If ΔBCD ΔFGH≅ , then which side is congruent to GH?
Back
CD
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How many degrees are in the exterior of a nonagon?
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360o
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What property is true of all parallelograms?
Back
Both pairs of opposite sides are parallel, diagonals bisect each other, both pairs of opposite sides are congruent, both pairs of
opposite angles are congruent.
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Find the area of this trapezoid.
42.5cm2
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Are these two triangles congruent? Why/ why not?
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Solve for x in this parallelogram.
X=30
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Reflexive property
Why is BD≅BD?
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How many degrees are in each exterior angle of an octagon?
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45o
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It has two congruent angles (Isosceles)
If a triangle has two congruent sides, what can you conclude?
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If a regular polygon has an angle sum of 1440o, how many sides must it have?
10 sides
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Name the steps to writing a good two column proof
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Solve for x and y in this parallelogram. What is x+y?
x+y =13
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In order to prove that CB≅ZX, what do we have to prove first?
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ΔCBA≅ΔZXY
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In a regular hexagon, with each exterior angle equal to x+20, what
is the value of x?
Back
40o
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What do rhombi and rectangles have in common?
Back
They are both parallelograms (have all the properties of
parallelograms)
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A=bh
What is the formula for the area of a rectangle?
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Write a proof.
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Find AC + BD in this parallelogram.
22