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1. Parallel lines are
coplanar.
2. Skew lines
intersect.
3. Alternate interior angles are
supplementary.
4. If lines are parallel, then corresponding angles are
congruent.
5. The interior angles of a triangle
sum to 360.
6. The exterior angles of a triangle
sum to 360.
7. A triangle is
a regular polygon.
8. Inductive reasoning is __________ based on a theorem.
9. A right triangle is
scalene.
10.
An obtuse triangle is
equiangular.
11.
A regular polygon is
equilateral.
b
a
1
2
5
3
6
9
13
4
7
10
c
8
11
14
12
15
d
16
Say whether the angles are alternate interior, same-side
interior or corresponding
1. 2 and 13
5. 6 and 14
2. 1 and 6
6. 15 and 4
3. 10 and 11
7. 8 and 12
4. 3 and 11
8. 6 and 3
In the picture below, either a || b, c || d or neither
b
a
1
2
5
3
6
9
13
4
7
10
c
8
11
14
12
15
d
16
1. 5 suppl. 9
5. 9  11
2. 2  7
6. 3  16
3. 7  12
7. 6 suppl. 14
4. 11 suppl. 12
8. 1  3
1. Find the sum of the interior angles of a 15-sided polygon.
2. Find the sum of the exterior angles of a 36-sided polygon.
3. What is the measure of one exterior angle of a regular
pentagon?
4. What is the measure of one interior angle of a regular decagon?
5. How many sides does a regular polygon have if each exterior
angle is 90?
6. What is the measure of each central angle of a regular octagon?
7. The measure of one interior angle of a regular polygon is 140°.
How many sides does the polygon have?
1. If x and 2x – 15 represent the measures of two acute angles of a
right triangle, find x and the measure of the angles.
2. Find the measures of 1, 2, 3, and 4.
45
1
3
2
125
3. Draw a right isosceles triangle.
4. Draw an obtuse scalene triangle.
5. Draw an acute equilateral triangle.
6. Draw an equiangular triangle.
15
4
m1  3x  20,
1. m2  2 x  15
2. ABCDE is regular
A
4
1
67°
2
3
B
5
E
1
2
D
3.
5
6
3
1
2
40°
4
23°
C
3
F
1. Given: a∥ b, 1  2
Prove: 3  4
1
a
2
3
4
b
2. Given: 2 ≅ 5; BE bisects CBD
Prove: AC  DE
A
B
1
D
2
4
C
3
5
E
3. Given: k||n;
Prove: 1 is supplementary to4
k
1
3
2
n
4
t