1. 8.3 Prove Quadrilaterals are Parallelograms
January 24, 2014
1. Find the values of a & b in the .
Bellwork
a­12
b+10
a = 42, b = 26
36
30
2. Find the measure of <K in the .
L
K
64
116
M
J
3. Find the m<BCD & BD in the .
B
100
C
9
E
<BCD=43 , BD=18
37
A
D
Dec 21­8:29 AM
HW pg. 526 #4­20 evens
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2. 8.3 Prove Quadrilaterals are Parallelograms
January 24, 2014
Ways to prove a quadrilateral is a parallelogram...
1. Show both pairs of opp. sides are // (definition)
2. Show both pairs of opp sides are
≅. (theorem)
3. Show both pairs of opp. < are
≅. (theorem)
4. Show 1 pair of opp. sides are
≅ and //. (theorem)
5. Show the diagonals bisect each other. (theorem)
8.3 Show that a Quad is a Parallelogram
Dec 21­12:45 PM
HW pg. 526 #4­20 evens
2

3. 8.3 Prove Quadrilaterals are Parallelograms
January 24, 2014
Dec 22­8:20 AM
HW pg. 526 #4­20 evens
3

4. 8.3 Prove Quadrilaterals are Parallelograms
January 24, 2014
Dec 22­8:22 AM
HW pg. 526 #4­20 evens
4

5. 8.3 Prove Quadrilaterals are Parallelograms
January 24, 2014
Dec 22­8:24 AM
HW pg. 526 #4­20 evens
5

6. 8.3 Prove Quadrilaterals are Parallelograms
January 24, 2014
Dec 22­8:22 AM
HW pg. 526 #4­20 evens
6

7. 8.3 Prove Quadrilaterals are Parallelograms
January 24, 2014
8.3 HW pg. 526 #4­20 evens
Dec 22­8:27 AM
HW pg. 526 #4­20 evens
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