# Obtuse Triangles - Help with drawing!

• Oct 6th 2013, 09:26 PM
mmonkman
Obtuse Triangles - Help with drawing!
Hi, I received this question today. I need help with the placement of the 120 degree angle and 20 degree angle. The wording is confusing. Any help is appreciated.

Thanks!

A surveyor is measuring the length of a lake. He takes angle
measurements from two positions, A and B, that are 136 m apart
and on the same side of the lake. From B, the measure of the angle
between the sight lines to the ends of the lake is 130°, and the
measure of the angle between the sight lines to A and one end of
the lake is 120°. From A, the measure of the angle between the
sight lines to the ends of the lake is 65°, and the measure of the
angle between the sight lines to B and the same end of the lake is
20°. Calculate the length of the lake, to the nearest metre.
• Oct 6th 2013, 11:25 PM
votan
Re: Obtuse Triangles - Help with drawing!
Quote:

Originally Posted by mmonkman
Hi, I received this question today. I need help with the placement of the 120 degree angle and 20 degree angle. The wording is confusing. Any help is appreciated.

Thanks!

A surveyor is measuring the length of a lake. He takes angle
measurements from two positions, A and B, that are 136 m apart
and on the same side of the lake. From B, the measure of the angle
between the sight lines to the ends of the lake is 130°, and the
measure of the angle between the sight lines to A and one end of
the lake is 120°. From A, the measure of the angle between the
sight lines to the ends of the lake is 65°, and the measure of the
angle between the sight lines to B and the same end of the lake is
20°. Calculate the length of the lake, to the nearest metre.

Attachment 29392
• Oct 8th 2013, 07:19 PM
mmonkman
Re: Obtuse Triangles - Help with drawing!