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Geometry: Triangles Classroom ActivitiesDownload
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Special Segments in Triangles

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Students will construct and explore medians, altitudes, angle bisectors, and perpendicular bisectors of triangles. They then drag the vertices to see where the intersections of the segments lie in relation to the triangle, and they measure distances to identify relationships.
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    TI-84 Plus CE
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    TI-84 Plus C Silver Edition
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Triangle Sides & Angles

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Students will explore side and angle relationships in a triangle. First, students will discover where the longest (and shortest) side is located relative to the largest (and smallest) angle. Then, students will explore the Isosceles Triangle Theorem and its converse. Finally, students will determine the number of acute, right, or obtuse angles that can exist in any one triangle.
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    TI-84 Plus CE
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    TI-84 Plus C Silver Edition
  • TI-84 Plus Silver Edition
  • TI-84 Plus
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Exterior & Remote Interior Angles

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Students investigate an exterior angle and its two remote interior angles.
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    TI-84 Plus CE
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    TI-84 Plus C Silver Edition
  • TI-84 Plus Silver Edition
  • TI-84 Plus
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8892_Step_2

Angle Bisectors in a Triangle

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Students explore the relationships between an angle bisector and segments in a triangle.
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    TI-84 Plus CE
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    TI-84 Plus C Silver Edition
  • TI-84 Plus Silver Edition
  • TI-84 Plus
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BalancingPoint_1

Balancing Point

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In this activity, students will explore the median and the centroid of a triangle.
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    TI-84 Plus CE
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    TI-84 Plus C Silver Edition
  • TI-84 Plus Silver Edition
  • TI-84 Plus
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HangingWithTheIncenter_ActivityOverview

Hanging with the Incenter

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In this activity, students will explore the perpendicular bisector theorem and discover that if a point is on the perpendicular bisector of a segment, then the point is equidistant from the endpoints.
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    TI-84 Plus CE
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    TI-84 Plus C Silver Edition
  • TI-84 Plus Silver Edition
  • TI-84 Plus
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8775_Step_2

Interior & Exterior Angles of a Triangle

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Students measure interior and exterior angles of a triangle and make conjectures about their relationships.
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    TI-84 Plus CE
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    TI-84 Plus C Silver Edition
  • TI-84 Plus Silver Edition
  • TI-84 Plus
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PerpendicularBisector_1

Perpendicular Bisector

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Students will explore the perpendicular bisector theorem and discover that if a point is on the perpendicular bisector of a segment, then the point is equidistant from the endpoints.
  • ax-icon-color-device
    TI-84 Plus CE
  • ax-icon-color-device
    TI-84 Plus C Silver Edition
  • TI-84 Plus Silver Edition
  • TI-84 Plus
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Special Triangles

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Students visualize the construction of special right triangles and find the ratios of the sides.
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    TI-84 Plus CE
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    TI-84 Plus C Silver Edition
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7897_Step_2

The Hinge Theorems

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Students explore the inequality relationships that arise when some of the triangle congruence conditions are in place but others are not.
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    TI-84 Plus CE
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    TI-84 Plus C Silver Edition
  • TI-84 Plus Silver Edition
  • TI-84 Plus
Download9,150