4.2 day 1 2012.notebook
November 15, 2012
Parts of an Isosceles Triangle
• Legs: The two congruent sides
• Base: The third remaining side
4.1 Properties of isosceles triangles
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Isosceles Triangle Conjecture
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Equilateral Triangles
• If a triangle is isosceles, then
• Equilateral triangles have at least two congruent sides, so
they fit the definition of isosceles triangles.
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• Any property of an isosceles triangle is true for an
equilateral triangle
Is the converse true?
• If a triangle has 2 congruent angles, then it is an isosceles
triangle. -> True or False
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Ex. 1 Find x and y
Ex. 2 Find x and y
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4.2 day 1 2012.notebook
November 15, 2012
Ex. 3 Find x and y
Ex. 4 Find x and y
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