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Foundations of Math 11
Chapter 2 – Angles & Triangles
Notes Booklet
Homework Assignments
(Nelson Foundations of Mathematics 11 Workbook)
Chapter 2 Properties of Angles and Triangles
Section Topic
2.1
2.2
2.3
2.4
Review
Exploring Parallel Lines
Angles Formed by Parallel Lines
Angle Properties in Triangles
Angle Properties in Polygons
Assignment
P38:
P42:
P47:
P51:
1-6 and P40: 1-5
1-2, 4, 6acd, 7-10, 12-13
1-2, 4-5, 7, 8a, 9-12
1-7, 9-11
FOM11
2.1 Exploring Parallel Lines
Geometry Review:
Different kinds of triangles/quadrilaterals:
Symbols:
Similar shapes / Congruent shapes:
Parallel Line rules and terms:
FOM11
2.2 Notes:
Angles Formed by Parallel Lines
Setting up a two-column proof in Geometry
Ex1
Given that  CAE,  EBD and  ECA are 25º, 70º, and 115º respectively, prove
that BE and DE are the same length.
B
C
E
A
D
Parallel Line theorems:
Other useful and common theorems:
Ex2
Given: BID  36 , HFD  63 , EF  AB , and EF  CD .
Prove that EFD is isosceles
E
G
A
H
C
F
I
B
D
FOM11
2.3 Notes:
Angle Properties in Triangles
FOM11
2.4 Notes:
Angle Properties in Polygons
Sum of the interior angles
Ex1
A polygon has 9 sides. What is the sum of the interior angles?
Ex2
The sum of the interior angles of a polygon is 1800°. How many sides
does the polygon have?
Measure of each interior angle in a regular polygon
Ex1
What is the measure of the interior angle in a regular octagon?
Ex2
A regular polygon has interior angles measuring 108°. How many sides
does the polygon have?
Exterior angles
Tessellation