SWBAT apply & identify the equilateral and isosceles triangle theorem (4.5)

Warm-Up: questions from wks #35-41 *hw/hw log/regular wkb p. 107 Tab: Storybook “Congruent Triangles” in bucket A SWBAT apply & identify the equilateral and isosceles triangle theorem (4.5) Homework (day 28): Honors: p. 253 (2, 5, 6-21, 23, 27, 30-32)/Quiz (new constructions included) Regular: wkb p. 107-108 (1-18 and 21-23)/Quiz (new constructions included) Pearsonsuccess due Friday!

B Properties of Isosceles Triangles An isosceles triangle is a triangle with two congruent sides. Therefore, how many congruent angles would there be? Label the following: Vertex angle Base angle Leg Base A C

A B C Isosceles Triangle Theorem- if two sides of a triangle are congruent opposite angles are congruent (base angles) The converse is also true……

A 3x - 7 x+15 ° ° B 50 50 C Find the value of x. • Name Two Congruent Angles: • Name Two Congruent Segments:

Properties of Equilateral Triangles A triangle is equilateral if and only if it is equiangular. Each angle of an equilateral triangle measures 60°. 60° 60° 60°

Triangle EFG is equilateral, and segment EH bisects angle E Find the following: m<FEH= _____ m<F= _____ m<GHE= _____ Classify Triangle FHE ______ Classify triangle GEF ______

Let’s Practice“Isosceles Triangle Worksheet”………..or Stations

Given:Prove:

SWBAT apply & identify the equilateral and isosceles triangle theorem (4.5)