Yeah, parent-teacher conferences!

Find the measures of the numbered angles

m∠1 = 60 ° m∠2 = 50 ° m∠3 = 80 ° m∠4 = 100 °

Lesson 4-3

• I can name and label corresponding parts of congruent triangles.

vertices

S

A

M

ΔSAMΔMSAΔASMetc…..

sizeshape

Angle measure

betweenness

colinearity

distance A

B

CD

W

X

YZ

∆ABC ≅ ∠A ≅ ∠J ∠B ≅ ∠K ∠C ≅ ∠L∆JKL AB ≅ JK BC ≅ KL CA ≅ LJ

R

G

D

X

L

N

∠G ≅ ∠L ∠R ≅ ∠X ∠D ≅ ∠N GR ≅ LX RD ≅ XN GD ≅ LN

∆ABC ≅∆ADC ∠B ≅ ∠D ∠ACB ≅ ∠ACD ∠BAC ≅ ∠DAC

AB ≅ AD BC ≅ DC AC ≅ AC

B

A C

D

A C

∆DCB∠D ∠DCB ∠DBC DC CB DB

ASSIGNMENT:4-2 worksheet