Linear Pair and Vertical Angles



Lesson Plan #17

Class: Geometry Date: Friday/Monday November 6th/9th 2020

Topic: Using postulates and definitions to prove statements in geometry

Aim: Students will be able to use postulates and definitions to prove statements in geometry?

Objectives:

Students will be able to use definitions, postulates and theorems to prove statements.

Note:

• Test #3 December 3rd or December 4th

• Below are the theorems we proved previously

o Theorem - If two angles are right angles, then they are congruent.

o Theorem - If two angles are straight angles, then they are congruent.

o Theorem - If two angles are complements of the same angle, then they are congruent.

o Theorem - If two angles are supplements of the same angle, then they are congruent.

o Theorem – If two angles are congruent, their complements are congruent.

o Theorem – If two angles are congruent their supplements are congruent.

Do Now:

Recall the definition of a linear pair:

A linear pair of angles are two adjacent angles whose sum is a straight angle.

Fill in the missing reason in the proof

Given:

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