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

© 2006 by Mr. Mayers

POLYGONSJUDGE

VALIDITYFORMULAS

PARALLELOGRAMS

Team 1 Team 2 Team 3 Team 4

0 0 0 0

If ΔABC ΔDEF≅ , then which angle is congruent to C?

Back

F

In a regular pentagon, each side is 31cm. What is the perimeter?

Back

155cm

Find a counterexample to this statement:If a quadrilateral has all angles congruent, then it is a square.

Back

Rectangle

What is the formula for the area of a trapezoid?

Back

A = (b1+b2) h 2

Back

A geometric object is congruent to itself. (AB≅AB or <C≅<C)

What is the reflexive property?

Back

Classify this quadrilateral

Kite

What does CPCTC stand for?

Back

Corresponding Parts of Congruent Triangles are Congruent

How many total degrees are in the interior of a hexagon? What formula did you use?

Back

720o, 180(n-2)

What do all right angles have in

common?

Back

They are congruent, their angle measures are equal.

Back

Find the area of a parallelogram with base=3n and height=4mn.

12mn2

Back

Vertical Angles are opposite angles from where 2 lines cross.

What are vertical angles?

Back

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.

If ΔBCD ΔFGH≅ , then which side is congruent to GH?

Back

CD

How many degrees are in the exterior of a nonagon?

Back

360o

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.

Back

Find the area of this trapezoid.

42.5cm2

Back

Are these two triangles congruent? Why/ why not?

Back

Solve for x in this parallelogram.

X=30

Back

Reflexive property

Why is BD≅BD?

How many degrees are in each exterior angle of an octagon?

Back

45o

Back

It has two congruent angles (Isosceles)

If a triangle has two congruent sides, what can you conclude?

Back

If a regular polygon has an angle sum of 1440o, how many sides must it have?

10 sides

Back

Name the steps to writing a good two column proof

Back

Solve for x and y in this parallelogram. What is x+y?

x+y =13

In order to prove that CB≅ZX, what do we have to prove first?

Back

ΔCBA≅ΔZXY

In a regular hexagon, with each exterior angle equal to x+20, what

is the value of x?

Back

40o

What do rhombi and rectangles have in common?

Back

They are both parallelograms (have all the properties of

parallelograms)

Back

A=bh

What is the formula for the area of a rectangle? 

Back

Write a proof.

Back

Find AC + BD in this parallelogram.

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