Isosceles and equilateral triangles
- Lesson: 1a1:03
- Lesson: 1b2:05
- Lesson: 1c1:49
- Lesson: 1d2:05
- Lesson: 24:25
Isosceles and equilateral triangles
Lessons
- 1.Find x.a)
b)
c)
d)
- 2.In △DEF, EY is a perpendicular line to DF and Y is the midpoint of DF. Why is △DEF an isosceles triangle? Show your reasoning.
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5.
Triangles and special triangles
5.1
Pythagorean theorem
5.2
Solving expressions using 45-45-90 special right triangles
5.3
Solving expressions using 30-60-90 special right triangles
5.4
Classifying triangles
5.5
Congruence and congruent triangles
5.6
Triangles congruent by SSS proofs
5.7
Triangles congruent by SAS and HL proofs
5.8
Triangles congruent by ASA and AAS proofs
5.9
Isosceles and equilateral triangles