In a geometry lesson, which change most effectively reduces extraneous cognitive load?

• A. Removing irrelevant decorations and simplifying pages to focus on essential relationships.
• B. Adding decorative graphics and animations that do not aid problem solving.
• C. Increasing the number of steps without guiding questions.
• D. Presenting random facts about triangles without context.

Answer: (D)

Reducing extraneous cognitive load means removing anything that clutters the learner’s working memory so they can focus on the essential ideas. In geometry, that means designing the lesson so students can concentrate on the relationships that matter—how angles relate, how sides and shapes correspond, and how properties like similarity or congruence demonstrate those relationships.

The best change is to remove irrelevant decorations and simplify pages to spotlight those essential relationships. When visuals are clean and purposeful, students aren’t distracted by decorations or ornamental elements, and their cognitive resources can be devoted to understanding the geometric connections and constructing accurate mental models.

Adding decorative graphics and animations that don’t help solve problems introduces unnecessary visual noise, which competes for attention and makes processing the core concepts harder. Increasing the number of steps without guiding questions adds both complexity and confusion, increasing the cognitive effort required to reach understanding. Presenting random facts about triangles without context provides unrelated information that doesn’t support the current learning goal, further taxing working memory without aiding schema construction.

So, the most effective way to reduce extraneous load is to streamline the visuals and focus on the essential geometric relationships.