Virginia SOL 1.MG.2.e
The Standard
Recognize and name the angles found in rectangles and squares as right angles.
Virginia Standards of Learning for Mathematics · The student will describe, sort, draw, and name plane figures (circles, triangles, squares, and rectangles), and compose larger plane figures by combining simple plane figures.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students identify a right angle by comparing a corner with a known square corner. They find and name every right angle in squares and rectangles, even when the shape is turned.
What Mastery Looks Like
- Given mixed shapes, students correctly mark all four right angles in each square and rectangle. They explain that turning or resizing a shape does not change its angles.
Common Misconceptions
- Students may think a right angle must point to the right. They may believe a tilted shape loses its right angles or that only squares have them. Some count sides instead of corners.
How to Assess It
- On an exit ticket, draw a tilted square, a rectangle, and a triangle. Ask students to circle and label every right angle in the square and rectangle.
Lesson moves
Ways to Teach It
Give each student a cardstock square corner, then have them test every corner on paper squares, rectangles, triangles, and circles.
Show a tilted square and ask, “How can you prove its corners are right angles?” Students draw or write one reason.
Play Right Angle Sort: students place shape cards under All Four, Some, or None, then check each corner with a paper tester.
Hunt around the classroom for square and rectangular objects, then list three objects and count the right angles on each face.
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Related Standards
- 4.MG.5.e
Denote properties of quadrilaterals and identify parallel sides, congruent sides, and right angles by using geometric markings.
- 4.MG.5.c
Identify and describe parallel, intersecting, perpendicular, and congruent sides in quadrilaterals.
- 4.MG.5.b
Identify and describe points, line segments, angles, and vertices in quadrilaterals.
- 5.MG.3.c
Identify congruent sides and right angles using geometric markings to denote properties of triangles.
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