# Triangle Centers

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 Early Edge: Triangles: Perimeter and Area     In this Early Edge video lesson, you'll learn more about Triangles: Perimeter and Area, so you can be successful when you take on high-school Math & Geometry. The Princeton Review Early Edge: Equilateral, Isoceles and Scalene Triangles     In this Early Edge video lesson, you'll learn more about Equilateral, Isoceles and Scalene Triangles, so you can be successful when you take on high-school Math & Geometry. The Princeton Review Early Edge: Types of Angles     In this Early Edge video lesson, you'll learn more about Types of Angles, so you can be successful when you take on high-school Math & Geometry. The Princeton Review Online Scientific Calculator     A helpful scientific calculator that runs in your web browser window. Holt Online Learning The Centroid of a Triangle     This interactive site defines a triangle’s centroid, gives interesting facts of a centroid and allows users to manipulate a virtual triangle showing the different positions a centroid can have based on a given triangle. Math Open Reference The Circumcenter of a Triangle     This interactive site defines a circumcenter of a triangle, gives relevant properties of a circumcenter and allows users to manipulate a virtual triangle showing the different positions a circumcenter can have based on a given triangle. Math Open Reference Early Edge: Triangles     In this Early Edge video lesson, you'll learn more about Triangles, so you can be successful when you take on high-school Math & Geometry. The Princeton Review Constructing the Orthocenter of a Triangle     This website shows an animated demonstration for constructing the orthocenter of a triangle using only a compass and straightedge. It also includes step-by-step written instructions for this process. Math Open Reference Constructing the Circumcenter/Circumcircle of a Triangle     This website shows an animated demonstration for constructing the circumcenter of a triangle, and thus the circumcirlce of the triangle, using only a compass and straightedge. It also includes step-by-step written instructions for this process. Math Open Reference Constructing the Incenter of a Triangle     This website shows a step-by-step demonstration for constructing the incenter of a triangle using only a compass and straightedge. It also includes step-by-step written instructions for this process. Math Open Reference
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