Upcoming SlideShare
×

# 4.2 congruence and triangles

1,321 views

Published on

Published in: Technology, Education
0 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
Your message goes here
• Be the first to comment

• Be the first to like this

Views
Total views
1,321
On SlideShare
0
From Embeds
0
Number of Embeds
5
Actions
Shares
0
26
0
Likes
0
Embeds 0
No embeds

No notes for slide

### 4.2 congruence and triangles

1. 1. Congruence and Triangles
2. 2. Congruent Figures • Two plane figures are congruent if they are the same size and shape - that is, if their corresponding angles are equal and their corresponding sides are equal. http://www.math.com/school/subject3/lessons/S3U3L1GL.html
3. 3. ∠A P≅ ∠ ∠B Q≅ ∠ ∠C R≅ ∠ Corresponding Angles Corresponding Sides PQAB ≅ QRBC ≅ PRAC ≅
4. 4. Example 1 Corresponding Angles Corresponding Sides a. Find the value of x. b. Find the value of y. ∠D K≅ ∠ ∠E L≅ ∠ ∠F M≅ ∠ ∠G N≅ ∠ KLDE ≅ LMEF ≅ MNFG ≅ KNDG ≅
5. 5. Theorem 4.3 – Third Angles Theorem • If two angles of one triangle are congruent to two angles of another triangle, then the third angles are congruent.
6. 6. Example 2- Using the 3rd Angle Theorem • Find the value of x in the diagram.
7. 7. Example 3 – Determining whether triangles are congruent • Decide if the triangles are congruent. Justify your reasoning.
8. 8. Homework • Exercise 4.2 page 205: 1-39, odd.