**Overview of Lesson: **The students will use Triangle Explorer to visually explore the basic concepts of area and perimeter of a triangle. The triangle that they will be working with are imposed on a grid so students can physically see that a right triangle is half of a rectangle or square. From this they should be able to find area and the edges to find perimeter. They will also learn about the formulas for finding area and perimeter of triangles on this web site. After the students find area and perimeter of various triangles, they will be expected to answer critical thinking questions to prove their understanding.

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**Standards:

Mathematics:

(See Standards Link for Complete Standards)

Number Sense and Operations- 6.N.11, 6.N.13

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**Patterns, Relations, and Algebra- 6.P.2

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**Measurement- 6.M.1, 6.M.4

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Technology:

(See Standards Link for Complete Standards)

Basic Operations and Concepts- 1.1, 1.3

Social, Ethical, and Human Issues- 2.5

Technology Productivity Tools- 3.2

Technology Problem-Solving and Decision Making Tools- 6.1

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****Student Outcomes: **By the end of the lesson, the students will be able to calculate the area of a triangle using the formula (Area = 1/2(base x height)). They will be able to explain where the formula originated from and how it is related to the formula for area of a rectangle.

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**Lesson 4 of 9

**Length of Lesson: **45 Minutes

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****Instructional Mode:** Whole Class/Partner Activity

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****Multiple Intelligences:** Verbal-Linguistic, Logical-Mathematical, Interpersonal, Visual-Spatial

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****Essential Questions:**

How do you find the area of a triangle?

Where did the formulas for area of a triangle originate?

How do you apply that formula to find the area of a triangle?

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**Materials/Resources Needed:

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- Computer Lab with Internet access
- Critical Thinking Questions Worksheet

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**Instructional Strategies/Procedure: