Q: How do you find angles of a triangle with a given slopes?

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Unless you are given atleast 2 other angles, there is no way to find them out.

In plane Euclidean geometry there are 3 angles in any triangle that add up to 180 degrees and if given 2 angles the sum of the 2 angles minus 180 will give the measure of the 3rd angle

It is impossible, you need height or angles at least

This is not sufficient information. The angles of a triangle add up to 180o and so all that can be deduced is that the remaining angles add up to 180o-38o which is 142o.

No. If you only know angles, you can't find any sides.Millions of triangles can all have the same angles. In fact, an infinite number of them can.

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It is impossible to find a triangle if only angle measures are given (all similar triangles have the same angles).

it is used to find the equation of lines and it is used to find the basic formula for finding angles in triangle, orthocentre, alititudes.etc

180 minus two known angles = unknown angle

Add together the given angles, or the angles you already know or have been given measures for, and then subtract the added numbers from 180 and that is you answer.

Unless you are given atleast 2 other angles, there is no way to find them out.

In plane Euclidean geometry there are 3 angles in any triangle that add up to 180 degrees and if given 2 angles the sum of the 2 angles minus 180 will give the measure of the 3rd angle

It is impossible, you need height or angles at least

This is not sufficient information. The angles of a triangle add up to 180o and so all that can be deduced is that the remaining angles add up to 180o-38o which is 142o.

No. If you only know angles, you can't find any sides.Millions of triangles can all have the same angles. In fact, an infinite number of them can.

One can't. The angle between those is needed.

I am guessing you mean you are given 2 of the 3 interior angles of a triangle and are asked for the 3rd. Well, it is a theorem that the 3 angles of a triangle add up to 180 degrees. So add the 2 given angles and subtract the sum from 180. to get the measure of the 3rd angle.

YesAnother Answer:-Yes under certain conditions depending on what type of triangle it is and the measure of the angle givenBut normally two angles are needed to find the third angle in a triangle