Browse

You are looking at 1 - 10 of 19 items for :

• Shapes
• Geometry
• Tenth
• Grade(s) or Audience
• Ninth
• Reasoning/Sense Making/Proof
• Other Topic
• Refine by Access: All content
Clear All
Restricted access

Triangles from Three Points

Using technology to solve triangle construction problems, students apply their knowledge of points of concurrency, coordinate geometry, and transformational geometry.

Restricted access

The Circle Approach to Trigonometry

A connected introduction of angle measure and the sine function entails quantitative reasoning.

Restricted access

Developing the Area of a Trapezoid

When calculating the area of a trapezoid, students use a range of problem-solving strategies and measurement concepts.

Restricted access

Using KenKen to Build Reasoning Skills

Through KenKen puzzles, students can explore parity, counting, subsets, and various problem-solving strategies.

Restricted access

Reinforcing Geometric Properties with Shapedoku Puzzles

Shapedoku puzzles combine logic and spatial reasoning with an understanding of basic geometric concepts.

Restricted access

Improving Student Reasoning in Geometry

Parallel geometry tasks with four levels of complexity involve students in writing and understanding proof.

Restricted access

Geometric Reasoning about a Circle Problem

An open-ended problem about a circle illustrates how problem-based instruction can enable students to develop reasoning and sense-making skills.

Restricted access

Thinking Like a Mathematician

The moves that mathematicians use to generate new questions can also be used by teachers and students to tie content together and spur exploration.

Restricted access

Dragging and Making Sense of Invariants in Dynamic Geometry

In this activity, students learn to make conjectures about properties that do not change.

Restricted access

Multiple Proof Approaches & Mathematical Connections

Using technology to explore the Three Altitudes of a Triangle problem, students devise many proofs for their conjectures.