# Geometry Fall 2011 Lesson 17 (S.A.S. Postulate)

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Lesson Plan #47
Class: Geometry
Date: Tuesday January 18th, 2016
Topic: Parallelograms
Aim: What are some properties of parallelograms?
Objectives:
1) Students will know the properties of a
parallelogram.
2) Students will be able to use the properties of a
parallelogram
HW #47:
Do Now:
Assignment #1:
1) A pair of consecutive vertices.
2) A pair of consecutive or adjacent sides.
3) Name a pair of opposite sides.
4) Name a pair of consecutive angles.
5) Name a pair of opposite angles
6) Name 2 diagonals.
Assignment #2:
How would you define a parallelogram?
Assignment #3:
ΜΜΜΜ
Given: Parallelogram ABCD with diagonal π΄πΆ
Prove: βπ΄π΅πΆ ≅ βπΆπ·π΄
Theorem:
PROCEDURE:
Write the Aim and Do Now
Get students working!
Take attendance, give back HW and collect HW
Go over the Do Now
Statements
Reasons
2
Properties of Parallelograms:
1) Opposite sides are parallel
2) A diagonal divides it into two congruent triangles
3) Opposite sides are congruent
4) Opposite angles are congruent
5) Consecutive angles are supplementary
6) The diagonals bisect each other
Online Activity:
http://www.mathsisfun.com/definitions/parallelogram.html
http://www.mathsisfun.com/geometry/parallelogram.html