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What do these two shapes have in common?
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Let’s call them triangle one and triangle two.
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On triangle one I noticed these two lines.
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These dashes on the triangle tell us that these two lines of this triangle are the same length.
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They are congruent.
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And when a triangle has two congruent sides, we call it an isosceles triangle.
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Triangle two also has two sides labelled as congruent.
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This makes triangle two an isosceles triangle.
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Maybe you’re thinking, “Wait!
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These sides are not the same length.”
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And that would be true.
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The two triangles are not congruent.
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They’re not the same size and the same shape.
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But because each of the triangles has two set of congruent sides, they are both isosceles triangles.