249
Chapter 8
61.
AB
is a side. Find the slope of
AB
.
m
y
x
2
2
y
x
1
1
5
2
(
(
2
5
)
)
7
3
62.
BD
is a diagonal. Find the slope of
BD
.
m
y
x
2
2
y
x
1
1
1
9
(
5
2)
14
63.
CD
is a side. Find the slope of
CD
.
m
y
x
2
2
y
x
1
1
9
1
(
2
2)
7
3
Tests for Parallelograms
Page 417
Geometry Activity: Testing for a
Parallelogram
1.
They appear to be parallel.
2.
The quadrilaterals formed are parallelograms.
3.
The measures of pairs of opposite sides are equal.
4.
Opposite angles are congruent, and consecutive
angles are supplementary.
5.
Opposite sides are parallel and congruent,
opposite angles are congruent, or consecutive
angles are supplementary.
Pages 420–421
Check for Understanding
1.
Both pairs of opposite sides are congruent; both
pairs of opposite angles are congruent; diagonals
bisect each other; one pair of opposite sides is
parallel and congruent.
2.
Sample answer:
3.
Shaniqua; Carter’s description could result in a
shape that is not a parallelogram.
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 Fall '10
 Dr.Zhan
 Calculus, PreCalculus, Angles, Parallelograms, Slope, Quadrilateral, opposite sides, 7 3 m

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