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January 31, 2015

January 31, 2015

Posted by **deborah** on Saturday, April 3, 2010 at 2:12pm.

A group of mountain climbers are using trigonometry to find the height of a mountain located in the rockies. From point A, which is due west of the mountain, the angle of elevation to the top is 56 degrees. From point B, which is due east of the mountain, the angle of elevation to the top is 38 degrees. Points A and B are 9.4 km apart. Determine the height of the mountain and round to the nearest metre.

- math -
**Damon**, Saturday, April 3, 2010 at 3:18pmtan 56 = h/x = 1.4826

tan 38 = h/(9.4-x) = .78129

solve for x and h

- math -
**DQR**, Saturday, April 3, 2010 at 3:21pmSketch it out, and you should find that if the height of the mountain is h, and the distance from the base of it to point A (which must be nearer than B) is a, then h/a = tan(56 Deg), and h/(9.4+a) = tan(38 Deg). Both of those tangents can be looked up in tables, so you should get two equations in h and a, which you can solve. Don't worry about the west and east bit: I reckon that's a red herring. A and B could just as easily be on the same line towards the base of the mountain.

- math -
**deborah**, Monday, April 5, 2010 at 10:25amthank you

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