NY Next Generation Math NY-4.G.2.c

Math4th GradeDraw and identify lines and angles, and classify shapes by properties of their lines and angles.

The Standard

Identify and name all quadrilaterals with four right angles as rectangles.

New York State Next Generation Mathematics Learning Standards

Teacher's field guide

What Students Need to Do: Students identify every quadrilateral with four right angles as a rectangle. They recognize squares as rectangles because squares also have four right angles.
What Mastery Looks Like: A student checks all four angles before naming a quadrilateral a rectangle. The student classifies a square as both a square and a rectangle and explains the shared property.
Common Misconceptions: Students may exclude squares from the rectangle category or decide from side lengths alone. They may check only one right angle and assume the other three are right.
How to Assess It: Show varied quadrilaterals, including a tilted rectangle and a square. Ask students to identify every rectangle and mark all four right angles.

Lesson moves

Test paper quadrilaterals with a right-angle corner tool, marking each angle before sorting the rectangles.
Ask students whether a square stops being a rectangle because all its sides are equal.
Play rectangle detective with rotated examples, squares, and near-misses that have only two right angles.
Inspect doors, screens, and tiles for quadrilaterals with four right angles and record every rectangle found.

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