Download 4.7 Use Isosceles and Equilateral Triangles

Geometry Chapter 4: Congruent Triangles 4.7-­‐ Use Isosceles and Equilateral Triangles SWBAT: use theorems about isosceles and equilateral triangles. Common Core: G.CO.6, G.CO.7, G.CO.8, G.CO.9, G.CO.10, G.CO.12, G.SRT.5
“Do Now” a) Classify the triangle by its sides and angles b) Solve for y Ø When an isosceles triangle has exactly two congruent sides, these two sides are the _____________________. Ø The angle formed by the legs is the ___________________________________________. Ø The third side is the __________________________ of the isosceles triangle. Ø The two adjacent angles are called the ______________________________________________. Geometry Chapter 4: Congruent Triangles Example: Apply the Base Angles Theorem In ∆𝐷𝐸𝐹, 𝐷𝐸 ≅ 𝐷𝐹. Name two congruent angles. Practice: 1. If 𝐻𝐺 ≅ 𝐻𝐾, then ∠ __________ ≅ ∠ __________ 2. If ∠𝐾𝐻𝐽 ≅ ∠𝐾𝐽𝐻, then __________ ≅ __________ Geometry Chapter 4: Congruent Triangles Example: a) Find 𝑚∠𝑅, 𝑚∠𝑆, 𝑚∠𝑇 Example: Find the values of x & y in the diagrams. a) b) Find 𝑚∠𝑋, 𝑚∠𝑍 Geometry Chapter 4: Congruent Triangles b) d) Homework: Practice 4.7 A #’s 1 – 23 All c)