Bell Work

1
Bell Work
(For help, go to the Lesson 1-4.)
2
2.4 Reasoning in Algebra

• Objectives
• Review and Refresh your memory on properties of
  equality from Algebra.
• Learn to connect reasoning in Algebra and
  Geometry.

3
REVIEW from ALGEBRA
4
GEOMETRY LESSON 2-4
Justify each step used to solve 5x 12 32 x
for x.
Given 5x 12 32 x
1. 5x 44 x Addition Property of
Equality 2. 4x 44 Subtraction Property of
Equality 3. x 11 Division Property of Equality
2-4
5
GEOMETRY LESSON 2-4
Suppose that points A, B, and C are collinear
with point B between points A and C. Solve for x
if AC 21, BC 15 x, and AB 4 2x.
Justify each step.
AB BC AC Segment Addition Postulate (4
2x) (15 x) 21 Substitution Property of
Equality 19 x 21 Simplify x 2 Subtraction
Property of Equality
2-4
6
ObjectiveReview and Refresh your memory on
properties of equality from Algebra.

• Algebra Proofs Worksheet in Class

7
Homework

• Pages 91-91(2-24 even)

8
DAY 2 (2.4)
9
Bell Work (day 2)
Name the justification for each
statement. 1. ab ab 2. If m?ABC 40
85, then m?ABC 45. 3. If k m and k w
12, then m w 12. 4. If B is a point in
the interior of ?AOC, then m?AOB m?BOC
m?AOC. 5. Fill in the missing
information. Given AC 36 a. AB BC
AC i. ? b. 3x 2x 1 36 ii. ?
  c. ?   iii. ?   d. 5x 35 iv.
?    e. x ?   v. ?  
Reflexive Property of Equality
Subtraction Property of Equality
Substitution Property of Equality
Angle Addition Postulate
Segment Addition Postulate   Substitution
Property of Equality 5x 1 36,
Simplify Subtraction Property of Equality 7,
Division Property of Equality
2-4
10
Properties of Congruence

• Objectives
• Review and Refresh your memory on properties of
  equality from Algebra.
• Learn to connect reasoning in Algebra and
  Geometry.

11

• Practice Workbook page 22 (1-14)
• Do the problems individually, but discuss with
  each other any questions or problems you have as
  I circulate around the room. Ask me if your
  group needs clarification or if no one
  understands what to to.

12
2.4 Reasoning in Algebra

• Objectives
• Review and Refresh your memory on properties of
  equality from Algebra.
• Learn to connect reasoning in Algebra ang
  Geometry.

13
Homework

• From Day 1 Pages 91-91(2-24 even)
• Day 2 Add to Day 1 hmwk (27-31 all)