Understand Shape Category Attribute Hierarchy Practice Test

A student learns that all isosceles triangles have at least two equal sides. She then identifies an equilateral triangle in her homework. She's unsure whether the rule about isosceles triangles applies to her equilateral triangle. Using shape hierarchy reasoning, what should she conclude?

A geometry app sorts shapes into categories. It states: 'All rhombuses have four equal sides and opposite angles are equal.' The app then shows an example of a square. Based on shape category relationships, what must be true about the square shown?