# Using Security Camera Angles to Find Area and Calculate Percentages

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### General Information

Subject(s): Mathematics
Intended Audience: Educators
Suggested Technology: Computer for Presenter, LCD Projector, Adobe Acrobat Reader, Microsoft Office
Instructional Time: 1 Hour(s) 20 Minute(s)
Keywords: area, triangles, quadrilaterals, percent, fractions, problem solving, real world, ratios, surface area, volume, small group
Instructional Component Type(s):
Resource Collection: Map.mathshell.org

## Aligned Standards

This vetted resource aligns to concepts or skills in these benchmarks.

## Related Resources

Other vetted resources related to this resource.

## Lesson Plan

Enrique's Ruined Carpet:

In this activity, students use a house blueprint to find the area of carpeted floor by decomposing composite shapes into rectangles and triangles. As students critique each other's reasoning, they refine their thinking of surface area.

Type: Lesson Plan

## Professional Development

What Does It Mean To Measure?:

This is a professional development session from the Learning Math series from Annenberg. Learners will begin to explore the questions "What can be measured?" and "What does it mean to measure something?" Learners identify measurable properties of objects such as weight, surface area, and volume, and discuss which metric units are appropriate for measuring these properties. Learners will also learn that measurement is, by its nature, approximate. Finally, learners will consider how to make measurements using nonstandard units. This session features a number of problems for learners to solve and open-ended questions to discuss, videos that demonstrate measurement techniques, and an interactive activity that asks learners to construct shapes using different size triangles to foster understanding of area and perimeter. There are also nine homework problems in which learners are asked to generate different measurements, graph measurements, and evaluate the appropriateness of the measurements generated using a data chart. Many of the professional development activities can be used directly in the classroom.

Type: Professional Development