LEARN NC

K–12 teaching and learning · from the UNC School of Education

Goal 2

Geometry and Measurement - The learner will use geometric and algebraic properties of figures to solve problems and write proofs.

Objective 2.03

Apply properties, definitions, and theorems of two-dimensional figures to solve problems and write proofs:

  • Triangles.
  • Quadrilaterals.
  • Other polygons.
  • Circles

Resources aligned to this objective

Discovering perimeters
By using string, students will discover a formula for finding the perimeter of a rectangle.
Format: lesson plan (grade 6–12 Mathematics)
By Jenny Crumpler.

Resources on the web

Symmetries I: Conclusions
This lesson challenges students to reflect on the mathematical ideas learned in a multi-part lesson on Geometry. (Learn more)
Format: lesson plan (grade 9 Mathematics)
Provided by: National Council of Teachers of Mathematics
Reflect on this
In this lesson, from Illuminations, students investigate reflections in a plane using mirrors (or other reflective materials) and a geometry utility. They apply their findings to examination of interior angles of regular polygons. (Learn more)
Format: lesson plan (grade 9–12 Mathematics)
Provided by: National Council of Teachers of Mathematics
Mathematical proofs
Students explore the nature of mathematical proofs and mathematical inquiry. (Learn more)
Format: lesson plan (grade 8–12 Mathematics)
Provided by: American Association for the Advancement of Science