5.GR.B.2: Explain that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category (e.g., all rectangles have four right angles and squares are rectangles, so all squares have four right angles).

Explain that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category (e.g., all rectangles have four right angles and squares are rectangles, so all squares have four right angles).

Example Problems

Decide whether the following statement is always, sometimes, or never true:
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\text{A rhombus is a square.}

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If it is sometimes true, draw and describe a figure for which the statement is true and another figure for which the statement is not true.

Decide whether the following statement is always, sometimes, or never true:
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\text{A square is a rhombus.}

"

If it is sometimes true, draw and describe a figure for which the statement is true and another figure for which the statement is not true.

Decide whether the following statement is always, sometimes, or never true:
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\text{A triangle is a parallelogram.}

"

If it is sometimes true, draw and describe a figure for which the statement is true and another figure for which the statement is not true.

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