Geometry and Angles · Semester 2

Angles in Quadrilaterals

Students will apply the property that the sum of angles in a quadrilateral is 360° to find unknown angles.

Key Questions

  1. Explain why the sum of angles in any quadrilateral is always 360 degrees.
  2. How can you decompose a quadrilateral into triangles to understand its angle sum?
  3. Analyze different types of quadrilaterals (e.g., square, rhombus, trapezium) and their angle properties.

MOE Syllabus Outcomes

MOE: Measurement and Geometry - S1MOE: Angles and Polygons - S1
Level: Primary 3
Subject: Mathematics
Unit: Geometry and Angles
Period: Semester 2

Suggested Methodologies

Gallery Walk

Create displays, rotate and critique

30–50 min

Learn more about Gallery Walk

Stations Rotation

Rotate through different activity stations

35–55 min

Learn more about Stations Rotation

Think-Pair-Share

Individual reflection, then partner discussion, then class share-out

10–20 min

Learn more about Think-Pair-Share

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More in Geometry and Angles

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Students will identify and describe rotational symmetry in 2D shapes, including the order of rotational symmetry.

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