Document Type

Lesson Plan

Publication Date

8-6-2006

Abstract

The students will investigate the sum of the interior angles of various triangles and conjecture and prove the following theorem: • The sum of the interior angles in a triangle is 180° . The extension activities include conjecturing and proving the following theorems: The sum of the interior angles in a quadrilateral is 360° . The sum of the measures of the interior angles in a convex n-gon is 180°(n-2).

Comments

Questions, comments or suggestions about this model may be sent to:
Dr. Leigh Little, The College at Brockport

Angle Sums.zip (21 kB)
Contains lesson plan and any application files

Tools used

Geometer’s Sketch pad

Grade Level

10

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