Access Point #: MAFS.912.G-CO.4.AP.12bArchived Access Point

Copy an angle.

Essential Understandings


  • When given an angle, use manipulatives (e.g., compass and straightedge, string, reflective devices, paper folding, dynamic geometric software, tracing paper, patty paper, etc.) to create another angle of equal degrees or measure.

    Image of two equal angles.
  • Draw a reference line with your straightedge. Place a starting point on the reference line.
  • Place the point of the compass on the vertex of begin mathsize 12px style angle B A C end style (point A).
  • Stretch the compass to any length so long as it stays ON the angle.
  • Swing an arc with the pencil that crosses both sides of begin mathsize 12px style angle B A C end style.
  • Without changing the span of the compass, place the compass point on the starting point of the reference line and swing an arc that will intersect the reference line and go above the reference line. (Click Here)
  • Go back to begin mathsize 12px style angle B A C end style and measure the width (span) of the arc from where it crosses one side of the angle to where it crosses the other side of the angle.
  • With this width, place the compass point on the reference line where the new arc crosses the reference line and mark off this width on the new arc.
  • Connect this new intersection point to the starting point on the reference line.
  • Understand the following concepts and vocabulary: angle, reference line, straightedge, arc, intersection point, rays, compass and vertex.
  • A shape formed by two lines or rays diverging from a common point..

  • º Formally: An angle is formed by the intersection of two rays with a common endpoint...
    º Informally: When two segments (or lines or rays) intersect, they form an angle..

    GradeMathHelp: Click Here
General Information
Number: MAFS.912.G-CO.4.AP.12b
Category: Access Points
Date Adopted or Revised: 07/14
Cluster: Make geometric constructions. (Geometry - Supporting Cluster)

Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters.

Related Standards

This access point is an alternate version of the following benchmark(s).

Related Courses

This access point is part of these courses.
1200400: Foundational Skills in Mathematics 9-12
1206310: Geometry
1206320: Geometry Honors
0101340: Three-Dimensional Studio Art 2
0101350: Three-Dimensional Studio Art 3 Honors
0104340: Drawing 1
0104350: Drawing 2
0104360: Drawing 3 Honors
0104370: Painting 1
0104380: Painting 2
0104390: Painting 3 Honors
0109310: Portfolio Development: Drawing-Honors
0109320: Portfolio Development: Two-Dimensional Design Honors
0109330: Portfolio Development: Three-Dimensional Design Honors
0114800: Florida's Preinternational Baccalaureate Art 1
0114810: Florida's Preinternational Baccalaureate Art 2
7912070: Access Mathematics for Liberal Arts
0101355: Creating Two-Dimensional Art
0101365: Creating Three-Dimensional Art
1206315: Geometry for Credit Recovery
1207300: Liberal Arts Mathematics 1
7912065: Access Geometry
0104335: Drawing 1
7967015: Access Drawing 1
0104412: Figure Drawing 2

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Element Cards

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Type: Element Cards

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