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What is a counterexample for three coplainar lines always make a triangle?
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Does an isosceles triangle have two equal lines?
Yes. Always
Does a triangle always have diagonal lines?
The sides of the triangle will always meet at angles such that two of them will appear 'diagonal'. But these are not defined as diagonal lines. There are actually no diagonals intersecting any triangle. Try drawing one and connecting the vertices - it doesn't work and you simply end up tracing over the lines that define the triangle.
Will the perpendicular bisectors of a right triangle always intersect?
yes, because perpendicular lines always intersect. all lines intersect unless they are parallel or on separate planes (skew)
How many sets of parrell lines are in a triangle?
There are no parallel lines in a triangle !
Is there a triangle with 2 lines of symmetry?
An equilateral triangle contains at least 2 lines of symmetry (it actually contains 3 lines of symmetry). An equilateral triangle is also radially symmetric.If the question is "Is there a triangle with exactly 2 lines lines of symmetry?", the answer is no.
What is a counterexample for three coplanar lines always make a triangle?
If at least two of the three lines are parallel, the three lines will not form a triangle.
Which type of triangle always has 3 lines of symmetry?
An equilateral triangle.
What has the shape of a triangle?
A triangle is 3 lines or sides connected together at their ends. These lines are not always the same lengths.
Does an isosceles triangle have two equal lines?
Yes. Always
Does a triangle always have diagonal lines?
The sides of the triangle will always meet at angles such that two of them will appear 'diagonal'. But these are not defined as diagonal lines. There are actually no diagonals intersecting any triangle. Try drawing one and connecting the vertices - it doesn't work and you simply end up tracing over the lines that define the triangle.
Are there oblique lines in a triangle?
Yes, there can be oblique lines in a triangle. However, there can only be oblique lines in a triangle if the triangle is considered to be a 'right' triangle.
What is a counterexample of All rectangles have two lines of symmetry?
Since the statement does not say that they have exactly two lines of symmetry, I do not believe that there is a counter example.
Will the perpendicular bisectors of a right triangle always intersect?
yes, because perpendicular lines always intersect. all lines intersect unless they are parallel or on separate planes (skew)
Does a acute triangle have parallel lines?
There are no parallel lines in a triangle.
Counterexample for two lines in a plane always intersect in exactly one point?
Line #1 ==> Y = x Line #2 ==> Y = x + 1 These two lines are parallel, have no points in common, and never intersect. (3 ways to say the same thing)
How many sets of parrell lines are in a triangle?
There are no parallel lines in a triangle !
Which triangle is the only triangle that has perpendicular lines?
The Right Triangle. Perpendicular lines make a right angle.
