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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!
CPCTC
POLYGONS
JUDGE
VALIDITY
FORMULAS
Team 1
Team 2
Team 3
Team 4
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© 2006 by Mr. Mayers
If ΔABC≅ΔDEF, then which
angle is congruent to C?
F
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In a regular pentagon, each side is 31cm.
What is the perimeter?
155cm
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Find a counterexample to this
statement:
If a quadrilateral has all angles
congruent, then it is a square.
Rectangle
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What is the formula for the area
of a trapezoid?
A = (b1+b2) h
2
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What is the reflexive property?
A geometric object is congruent to
itself. (AB≅AB or <C≅<C)
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Classify this quadrilateral
Kite
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What does CPCTC stand for?
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?
o
720 ,
180(n-2)
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What do all right angles
have in common?
They are congruent, their angle
measures are equal.
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Find the area of a parallelogram with
base=3n and height=4mn.
2
12mn
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What are vertical angles?
Vertical Angles are opposite angles from
where 2 lines cross.
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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?
CD
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How many degrees are in the
exterior of a nonagon?
o
360
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What property is true of all
parallelograms?
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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Why is BD≅BD?
Reflexive property
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How many degrees are in each exterior angle of an octagon?
45o
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If a triangle has two congruent
sides, what can you conclude?
It has two congruent angles (Isosceles)
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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?
ΔCBA≅ΔZXY
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In a regular hexagon, with each
exterior angle equal to x+20, what
is the value of x?
o
40
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What do rhombi and rectangles have in
common?
They are both parallelograms (have
all the properties of parallelograms)
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What is the formula for the area of a rectangle?
A=bh
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Write a proof.
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Find AC + BD in this parallelogram.
22
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