Study Guide — 4.G.A.2

Classify two-dimensional figures based on the presence or absence of…

Compare and analyze shapes — how they are alike and different.

What this standard means

• Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.
• Apply classify two-dimensional figures based on the presence or absence of… with models and explanation
• Compares shapes by attributes

_See printable PDF for diagram._

How to use the 20 practice sets

| Sets | When to use | | --- | --- | | 1–5 | Intro — explore together, short written items | | 6–10 | Core skills — diagrams and written practice | | 11–15 | Mixed review — explain thinking | | 16–20 | Stretch — word problems and mastery tasks |

Pacing: 10–15 minutes per session.

How to practice

1. Sort shapes into groups and explain why 2. Compare side lengths and angles informally 3. Draw shapes that fit a description

_See printable PDF for diagram._

Common mistakes

• Comparing by size only
• Missing a defining property

Review and practice tests

1. Start Review 1/10 when sets 1–3 feel comfortable. 2. Move up one review level with little help. 3. Use Practice Test 4/10–6/10 for mid-standard checks. 4. Practice Test 10/10 is the mastery bar for 4.G.A.2.

• [ ] Compares shapes by attributes
• [ ] Sorts with a clear rule
• [ ] Draws shapes to match criteria

Materials for this standard

• Practice Problems — 20 printable sets
• Review — 10 difficulty levels
• Practice Test — 10 difficulty levels
• Answer key — for parents and tutors