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04 Sep 2012, 22:56
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hi
I had a doubt while attempting a geometry question. If it is mentioned that triangle ABC is a right angle triangle, cant we assume that angle B is 90. Isnt that a standard usage?
Also, if Triangle MNP is a isosceles triangle can we assume that MN= NP.
I remember being taught in school that these are the ways in which we denote such figures, but will gmat specifically mention these. eg that if (tr)ABC is a rigth angle triangle then angle b is 90.
thanks
I had a doubt while attempting a geometry question. If it is mentioned that triangle ABC is a right angle triangle, cant we assume that angle B is 90. Isnt that a standard usage?
Also, if Triangle MNP is a isosceles triangle can we assume that MN= NP.
I remember being taught in school that these are the ways in which we denote such figures, but will gmat specifically mention these. eg that if (tr)ABC is a rigth angle triangle then angle b is 90.
thanks
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05 Sep 2012, 00:48
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adineo
I doubt any such convention being followed on the GMAT. Sometimes, a drawing is attached and the right angle marked. There might be additional info from which you can deduce which one is the right angle. Similar for an isosceles triangle.
Just for curiosity: did you learn in a European school?
09 Sep 2012, 08:54
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For all geometry questions, you don't necessarily need to consider B as 90 degree, unless otherwise it is specifically mentioned in the question.
You can assume any one of A,B,C as 90 degree and solve the problem. Only requirement is that the side opposite to right angle is the hypotenuse.
If B is 90 degree, then \(a^2 + c^2 = b^2\)
If A is 90 degree, then \(b^2 + c^2= a^2\)
If C is 90 degree, then \(a^2 + b^2 =c^2\)
where a,b, and c are sides opposite to angle A,B, and C respectively.
You can assume any one of A,B,C as 90 degree and solve the problem. Only requirement is that the side opposite to right angle is the hypotenuse.
If B is 90 degree, then \(a^2 + c^2 = b^2\)
If A is 90 degree, then \(b^2 + c^2= a^2\)
If C is 90 degree, then \(a^2 + b^2 =c^2\)
where a,b, and c are sides opposite to angle A,B, and C respectively.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
