1.
Students construct altitude locator according to directions:

a. Glue protractor to cardboard

b. Punch hole at midpoint in ruler side of protractor

c. Tie paper clip to string and then thread string through
hole in protractor and tie.

d. Glue drinking straw along ruler side of protractor
above the punched hole.

2.
One student stands at base of object (building or tree)
and walks away in straight line to an even distance (far
enough to be able to site the top of the object through
the drinking straw). Ruler side is the top and rest of protractor
hangs down.

3. Measure distance from base of object (building or tree)
to student with altitude locator.

4. Measure height of student to eye level.

5. Student sites to top of object with altitude locator
and finds number of degrees of angle marked by position
of string on protractor.

6. Look up tangent ratio from above table and multiply by
the distance between the object's base and the siting position.
Subtract the eye level height of the student who found the
angle. The result is the height of the object.