Education Technology

### Special Segments in Triangles

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.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Triangle Sides & Angles

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.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Exterior & Remote Interior Angles

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

### Angle Bisectors in a Triangle

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

### Balancing Point

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

### Hanging with the Incenter

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.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Interior & Exterior Angles of a Triangle

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

### Perpendicular Bisector

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.
• TI-84 Plus C Silver Edition
• TI-84 Plus Silver Edition
• TI-84 Plus
• TI-84 Plus CE Family

### Special Triangles

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