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Circles: Parts, Radius, Diameter, and Chords

4th Grade · Math · Open Global Math

5 lessons

Goal

Identify and define key parts of a circle including center, radius, diameter, and chord, understand the relationship d = 2r, and construct circles.

5 lessons
0 of 5 done
  1. Parts of a Circle: Radius, Diameter, and CenterUp next
  2. Identifying Radius, Diameter, and Chord on a FigureNot started yet
  3. Relationship Between Radius and DiameterYou are here
  4. Drawing Circles with a Compass Given a RadiusNot started yet
  5. Chords and Concentric Circles in Geometric PatternsNot started yet
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Learning standards covered

GlobalOGM.5.G.3Open Global Math Standards 2026™ · 4th Grade

Classify 2D figures based on angle types and side properties (triangles: acute, right, obtuse, equilateral, isosceles, scalene; sum of angles in a triangle = 180°; quadrilaterals: squares, rectangles, rhombuses, parallelograms, trapezoids; regular polygons; circles: radius, diameter, chord, center).