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 ΔSAM ΔMSA ΔASM etc…..

size shape

Angle measure betweenness colinearity distance A B C D W X Y Z

∆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