Download presentation

Presentation is loading. Please wait.

Published byChristopher Stevens Modified over 4 years ago

1
ACTIVITY 2 - HOW TALL IS… ? Tuesday November 30th, 2010 Rollie Comeau Watson Lake Secondary School

2
ACTIVITY 2 How tall is …? Specific Outcomes A.3 - 3.1 and 3.2 B.2 - 2.3 and 2.7 B.3 - 3.5, 3.6 and 3.7 B.4 - 4.1 and 4.2 B.5 - 5.1, 5.4, 5.7, and 5.8

3
ACTIVITY 2 How tall is …? Material needed: ProtractorTube (one foot long) TapeString WeightPencil PaperCalculator Warm Clothing

4
ACTIVITY 2 How tall is …? Problem You need to cross a particularly swift creek. It is too wide to jump. A tree stands close to the edge of the creek. How can you determine if the tree is long enough to safely span the creek?

5
ACTIVITY 2 How tall is …? Tree Ground Distance

6
ACTIVITY 2 How tall is …? To solve this problem, the concepts of similar triangles, right-triangles, trigonometry, parallel lines and transversal lines, and/or referents can be introduced in your lesson.

7
ACTIVITY 2 How tall is …? Lets use trigonometry to solve this problem. The three basic trigonometric ratios involve two sides of a right-triangle and one of the two acute angles.

8
ACTIVITY 2 How tall is …? In our case, we are looking for the height of the tree - this is the unknown value we are seeking.

9
ACTIVITY 2 How tall is …? The distance from the tree can be assessed with the help of a long measuring tape. This is one of our known values. We are missing an acute angle…

10
ACTIVITY 2 How tall is …? From the ground, looking up at the top of the tree, we could possibly determine the angle of elevation. For this, you will need to consult a surveyor who can measure it for you or, construct a simple device that can do it for you!

11
ACTIVITY 2 How tall is …? A simple clinometer comes to mind… lets construct one!

12
ACTIVITY 2 How tall is …? Before going outdoors, you will need to determine the height of your eyesight. For convenience, a measuring tape has been placed on the wall to assist you. Record this value on the Activity 2 data sheet provided.

13
ACTIVITY 2 How tall is …? As a group, select a set distance from the object to be measured. Record this value as Ground Distance.

14
ACTIVITY 2 How tall is …? Each member of the team should: a)Use the clinometer (viewing through the tube at the top of the tree) b)Take the reading off the clinometer (angle in degrees) c)Record the measurement read by b)

15
ACTIVITY 2 How tall is …? Upon return, a)Draw a diagram representing the problem we are attempting to solve b)Place all measurements in the diagram c)Use trigonometry to solve the problem

16
ACTIVITY 2 How tall is …? Share your answer with your group. 1.Discuss why your answer may vary compared to others. 2.Discuss factors that may influence your answers.

Similar presentations

Presentation is loading. Please wait....

OK

Trigonometry and angles of Elevation and Depression

Trigonometry and angles of Elevation and Depression

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google