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They both have 3 sides
They both have 3 interior angles that add up to 180 degrees
They both have 3 exterior angles that add up to 360 degrees
They both will tessellate
They both have an area that is 0.5*base*perpendicular height
They both have a perimeter which is the sum of their 3 sides
They both can be doubled up to form quadrilaterals
But an equilateral triangle has 3 equal sides whereas an isosceles triangle has only 2 equal sides
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