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How do you prove triangles are congruent?
you measure all the sides
If 3 corresponding angles of two triangles are of equal measure are the side lengths of equal measure also?
Not necessarily. You have described "similar" triangles. If you also know that any of the lengths of sides are of equal measure in addition to three angles (congruent), then the lengths of all of the sides are of equal measure. But with what you have given, consider, for example, two equilateral triangles, both have all angles equal to 60 degrees (satisfying the condition in your question). One of the triangles could have sides length 1 and the other with sides all of length 2.
How A pentagon can be divided into how many triangles by drawing all of the diagonals from 1 vertex?
Three triangles
If all of the diagonals are drawn from a vertex of an n-gon how many triangles are formed?
If all of the diagonals are drawn from a vertex of an octagon, how many triangles are formed
Some equilateral triangles are not isosceles?
All isosceles triangles are not equilateral triangles
If all of the diagonals are drawn from a vertex of an octagon how many triangles are formed?
5 triangles are formed.
How many triangles can be made in an octagon by drawing all the diagonals from one vertex?
You Can Get 6 triangles
A pentagon can be divided into how many triangles by drawing all of the diagonals from one vertex?
3 triangles
How many triangles have the angle measures 30 65 85?
As many as you like but they will all be scalene triangles
Are all equilateral triangles acute triangles?
Yes all equilateral triangles are acute triangles, but not all acute triangle are equilateral triangles.
Are some isosceles triangles equilateral triangles?
All isosceles triangles are not equilateral triangles
Are all triangles polgons?
yes. all triangles.
