You have to measure an angle, and a distance to do this. The last example I gave you is as accurate as you can measure the base distance along the river, and as accurate as one can measure angles with a protractor. Your comment it was just an estimate baffles me, it reflects on someones understanding of measurement and trig.
Good luck.
you are standing on one side of the river. Figure out the width of the river. All calculations have to be made on the side you are standing on. You cant step into the river or cross it. You may use the 2 laws ( sine and cos ). no guessing allowed. has to be accurate. The calculation that are done should be done by someone who is in grade 10. you cannot use Similar and congruent triangles not allowed
**i understand this question has been answered twice before but the frst time similar triangles were being used which is not allowed and 2nd time to figure out the angle. guessing was used which is again not allowed.
the answer has to be without guess and no use of similar triangles or congruent. 2 laws allowed
2 answers
Just Wondering,
Have you read the whole text?
Item 5 asks for an estimate of the width of the river (not a guess).
Item 7 requires a measurement of the angle using the protractor. In fact, the same measurement is repeated for a check. This is what surveyors do.
The distance is measured with a tape.
This use of the protractor is based on what a surveyor does, who uses a theodolite (measures to within 1-3 seconds of the arc). If you decide that a compass is acceptable, go right ahead. It would give the same order of accuracy as a protractor. Both give measurements, not guesses.
Also, do not forget to mention that the distance between the two points on the base line has to be the horizontal distance, which again is what surveyors do. The distance on the slope will give erroneous results for the width.
Have you read the whole text?
Item 5 asks for an estimate of the width of the river (not a guess).
Item 7 requires a measurement of the angle using the protractor. In fact, the same measurement is repeated for a check. This is what surveyors do.
The distance is measured with a tape.
This use of the protractor is based on what a surveyor does, who uses a theodolite (measures to within 1-3 seconds of the arc). If you decide that a compass is acceptable, go right ahead. It would give the same order of accuracy as a protractor. Both give measurements, not guesses.
Also, do not forget to mention that the distance between the two points on the base line has to be the horizontal distance, which again is what surveyors do. The distance on the slope will give erroneous results for the width.
3 answers