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4-5 Isosceles & Equilateral Triangles

4-5 Isosceles & Equilateral Triangles. *I CAN use the properties of isosceles triangles and apply them to find values and complete proofs *I CAN use the properties of equilateral triangles and apply them to find values and complete proofs.

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4-5 Isosceles & Equilateral Triangles

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  1. 4-5 Isosceles & Equilateral Triangles *I CAN use the properties of isosceles triangles and apply them to find values and complete proofs *I CAN use the properties of equilateral triangles and apply them to find values and complete proofs. *I CAN use the following vocabulary: base, legs, vertex angle, base angles, corollary.

  2. A A D B C D E

  3. P R

  4. YES. Since & by the Isosceles Triangle Theorem. YES. Since & so by the Transitive Property of Congruence. YES. Since & by the Converse of the Isosceles Triangle Theorem.

  5. C 27 90 C 27 90 117 63

  6. 61 119

  7. Objective Practices • Lesson Check: pg. 253 #1-5 • before you leave • HW: pg. 254 – 256 #7 – 31 odds

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