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Geometry 88 Online
OpenStudy (anonymous):

Triangulation is a method of finding the location of an object based on measurements made from two other locations. True or False?

OpenStudy (mathstudent55):

True

OpenStudy (tkhunny):

TRIangulation still takes THREE measurements.

OpenStudy (mathstudent55):

If you have one point and then two others, and they form a triangle, then by knowing some side lengths and angle measures, you can find the distance you are looking for. Your point of interest is the third in the triangle. That's why you only need two more points.

OpenStudy (tkhunny):

I agree the word "other" is not clear at all. Whatever the question means, TRIangulation takes THREE measurements. If "other" means you have one measurement, then yes, only two more are needed. Two me, if that is the meaning of "other", it seems the "other" location IS the location of the object. No need to triangulate that. The facts are these. 1) If you know the distance to your location, there are infinitely many solutions. 2) If you know the distance from another location as well, there are two possibilities. 3) The third measurement cuts it down to one.

OpenStudy (mathstudent55):

We want to know the height of the building. This problem is the same as finding the length y. |dw:1407121619692:dw|

OpenStudy (tkhunny):

Whatever you describe, it will lake three measurements.

OpenStudy (mathstudent55):

We use two other points, in addition to point A. The are points B and C. We can measure the distance from A to B since it's simply a distance on the ground. Also, using some angle measure, we can measure angle C. |dw:1407121725266:dw|

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