Description
In this lesson, students find the perimeter and area of triangles in the plane. Students realize that the distance formula is required to find the perimeter. Finding the area is more of a challenge, but the teacher guides students to understand that surrounding the triangle by a rectangle allows students to compute the area of the rectangle and the three right triangles that surround it and subtract these quantities.
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Credits
From EngageNY.org of the New York State Education Department. Geometry Module 4, Topic C, Lesson 9.
Available from engageny.org/resource/geometry-module-4-topic-c-lesson-9; accessed 2015-05-29.
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