6
Base angles of an
isosceles triangle
The angle included by the legs
is called the vertex angle and
the angles that have the base
as one of their sides are called
base angles.
7
Base of an
isosceles triangle
There are two sides that are
legs and the third side is the
non-congruent side of the
triangle.
III.
Cornell Notes:
Unit 5
Area
Essential Question:
How do we find the area of a circle?
Date: 5-6-19
Unit Objectives:
This unit covers concepts associated with congruent triangles, such as identifying corresponding parts
of congruent triangles, identifying isosceles and equilateral triangles, proving triangles congruent, and proving parts of
triangles congruent
Lesson
Lesson Objective
Notes:
Lesson
1
Recognize congruent
figures and their
corresponding parts
Lesso
n
_2___
Prove two triangles are
congruent using the SSS
postulates.
Side Side Side (
SSS
): If the three sides of
both triangles are
congruent
then
both triangles are congruent
. Side Angle Side
2
Prove two triangles are
congruent using the SAS
postulates.
(SAS
): If
two
sides and the included angle of
both triangles are
congruent
then
both triangles are congruent
.
3
Prove two triangles are
congruent using the ASA
The
ASA
(
Angle-Side-Angle
)
postulate
states that if
two
angles and
the included side of one
triangle are congruent
to
two
angles and
the included side of another
triangle
, then the
triangles are

postulate.
congruent.
3
Prove two triangles are
congruent using the AAS
theorem.
If two angles and a non-included side of one triangle are congruent to
the corresponding parts of another triangle, then the triangles are
congruent.

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- Winter '16
- Mrs. Goodwin