QR Challenge: Angles of Elevation & Depression

Created using the ClassTools QR Treasure Hunt Generator

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

• Download a QR reader (e.g. I-Nigma | NeoReader | Kaywa) onto their mobile devices
• Bring these devices into the lesson.

3. Print out the QR codes.

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

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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!

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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.

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Questions / Answers (teacher reference)

Question	Answer
1. The angle of elevation of the top of a flagpole from a point 20 m from its base is 48 degrees. Find the height of the flagpole.	22.2 m
2. The top of a tree, when viewed 50 m from its base, has an angle of elevation of 23 degrees. Find the height of the tree.	21.2 m
3. A person is 250 m from a cliff. The angle of elevation of the top of the cliff is 61 degrees. Find the height of the cliff.	451 m
4. The angle of depression from the top of a cliff 200 m above sea level to a boat is 57 degrees. How far is the boat from the base of the cliff?	130 m
5. When looking down to a person standing in a park 180 m from the base of a building, the angle of depression is 33 degrees. How high is the building?	117 m
6. The angle of depression from the top of a cliff 180 m above sea level to a boat is 48 degrees. How far is the boat from the base of the cliff?	162 m
7. A ladder leaning against a vertical wall reaches 3.5 m up the wall and makes an angle of 55 degrees with the ground. Determine the length of the ladder.	4.3 m long
8. A see-saw has length 5.2 m. When one end is resting on the ground it makes an angle of 23 degrees with the ground. Find the height of the other end above ground level.	2 m
9. When the sun is at an angle of elevation of 63 degrees, a tree casts a shadow of length 6.2 m. Find the height of the tree.	12.2 m
10. A rectangle has sides of length 12 cm and 8 cm. Determine the measure of the angles between the diagonal and each of the sides, correct to the nearest degree.	34 degrees and 56 degrees

 

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