A-Geometry
Ch 6 Review
Prize Show
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
1. True or False?
a.) Two lines must either
intersect or be parallel.
b.) Two lines  to the same
line are parallel.
c.) In a plane, two lines  to
the same line are parallel.
False
False
True
2. True or False?
a.) If a line is  to a plane, it is 
to every line in the plane.
b.) The intersection of 2 planes
always forms a line.
c.) If a line is  to a line in a plane,
the line is  to the plane.
False
True
False
3. True or False?
a.) Two lines  to the same line
are parallel.
b.) A line that is  to a horizontal
line is vertical.
c.) Three parallel lines
must be coplanar.
False
False
False
4. True or False?
a.) A line can be drawn  to each
of 2 intersecting planes.
b.) Any 3 points are always coplanar.
c.) Lines that do not intersect
are parallel.
False
True
False
5. True or False?
a.) If planes a and b are both parallel
to line m, then a b.
b.) If planes a and b are both 
to line m, then a
False
True
b.
c.) If a plane intersects two
parallel planes, the lines of
intersection are parallel.
True
6. Always, sometimes or never?
a.) As the # of sides of a regular
Never
polygon increases, the sum of
the exterior 's increases.
b.) As the # of sides of a regular
polygon increases, the measure
of an interior  increases.
Always
7. Always, sometimes or never?
a.) A convex polygon has an
interior  > 180.
b.) An equiangular polygon
is equilateral.
c.) An equilateral polygon
is equiangular.
d.) A regular polygon is
equilateral & equiangular.
Never
Sometimes
Sometimes
Always
8. Solve for x.
80°
x°
130
9.
Given: D is midpoint of AC ;
E is midpoint of BC ;
C
2  130;
4
4  40
D
Find: The measures of:
1, 3, 6, 6
A
3
5
2
1
1  50, 3  50, 5  90, 6  90
6
E
B
10. Given: a
b; c
1  75;
2  105
Solve for x.
d;
1
c
2
x
d
a
b
x  30
11.
a.) If the sum of the angles of
a polygon = 2360, how many
sides does the polygon have?
Impossible,
Polygon
does
not exist.
b.) If a regular polygon has an interior
 of 157.5, how many sides does the
16
polygon have?
12. a. How many diagonals can be drawn from
one vertex of an 18-gon?
 n - 3  18- 3  15
12. b. How many diagonals exist in an 18-gon?
n  n  3 18 18  3

 135
2
2