# Teacher Notes

## A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

• Bring these devices into the lesson.

4. Cut them out and place them around your class / school.

## B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

## C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

### Questions / Answers (teacher reference)

 Question Answer When 3 perpendicular bisectors intersect, what point do they form? circumcenter When 3 angle bisectors intersect, what point do they form? incenter When 3 altitudes intersect, what point do they form? orthocenter When 3 medians intersect, what point do they form? centroid Which special segment divides an angle into two angles of equal measure? angle bisector Which special segment goes through one vertex and is perpendicular to the side opposite? altitude Which special segment goes through one vertex and divides the opposite side into two pieces of equal length? median Which special segment divides a side into two equal lengths and is perpendicular to that side? perpendicular bisector Inside, Outside, or On the Triangle & Where? - The circumcenter for an acute triangle is located where? Inside Inside, Outside, or On the Triangle & Where? - The incenter for a right triangle is located where? Inside Inside, Outside, or On the Triangle & Where? - The orthocenter for an obtuse triangle is located where? Outside Inside, Outside, or On the Triangle & Where? - The centroid for an acute triangle is located where? Inside Inside, Outside, or On the Triangle & Where? - The circumcenter for a right triangle is located where? On the triangle, on the hypotenuse Inside, Outside, or On the Triangle & Where? - The incenter for an obtuse triangle is located where? Inside Inside, Outside, or On the Triangle & Where? - The orthocenter for an acute triangle is located where? Inside Inside, Outside, or On the Triangle & Where? - The centroid for a right triangle is located where? Inside Inside, Outside, or On the Triangle & Where? - The circumcenter for an obtuse triangle is located where? Outside Inside, Outside, or On the Triangle & Where? - The incenter for a right triangle is located where? Inside Inside, Outside, or On the Triangle & Where? - The orthocenter for an obtuse triangle is located where? Outside the triangle behind the obtuse angle Inside, Outside, or On the Triangle & Where? - The centroid of an acute triangle is located where? Inside

### Special Segments in Triangles and their Points- Geometry : QR Challenge

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### Special Segments in Triangles and their Points- Geometry : QR Challenge

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