Shapes and Angles

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Identify and draw right, obtuse, and acute angles.

Common Core Standards

Core Standards

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The core standards covered in this lesson

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4.G.A.1 — Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

Geometry

4.G.A.1 — Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures.

Foundational Standards

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The foundational standards covered in this lesson

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Geometry

3.G.A.1 — Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals). Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.

Criteria for Success

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The essential concepts students need to demonstrate or understand to achieve the lesson objective

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  1. Understand that a right angle is a square corner.
  2. Understand that an acute angle is one that measures less than a right angle.
  3. Understand that an obtuse angle is one that measures greater than a right angle but less than a straight angle.
  4. Understand that a straight angle is one that is formed by three points that are all on the same line.
  5. Determine whether angles are right, obtuse, or acute using a right-angle tool (MP.5).
  6. Draw right, obtuse, and acute angles (MP.5, MP.6).