A triangle has no parallel sides but a right angle triangle has perpendicular sides that meet at 90 degrees.
An Isosceles trapezoid has four sides (is a quadrilateral) with a pair of parallel sides and the other two sides of equal length; whereas An isosceles triangle has three sides with a pair of sides of the same length and the other side a different length.
None. A triangle (not even an equilateral one) has no parallel sides.
Any polygon can have only 1 pair of perpendicular sides.
Trapezoids have only one pair of parallel sides.
Yes. The orthocenter is the intersection of the altitudes; the circumcenter is the intersection of the perpendicular bisectors of the three sides of the triangle. The perpendicular bisector of and altitude to a given side are parallel, so they can coincide at the common center only if they are the same; that means that the opposite vertex is on the perpendicular bisector, so the other two sides are equal. Thus each pair of sides are equal, so the triangle is equilateral.
This quadrilateral is a trapezoid. In a trapezoid, one pair of opposite sides is parallel, and one pair of opposite sides is congruent. The other two sides are not parallel or congruent.
No because it has 1 pair of parrell sides
Assuming that parrell is a weird way of writing parallel, it would be a right trapezium (right trapezoid in the US).
A triangle.
A right triangle.
It is impossible for a triangle to have any parallel sides. ■
Scalene
i am not really sure but i think it is the isosceles triangle
It can have a pair of equal sides.
An isosceles triangle.
Any shape, other than a triangle can have a pair of perpendicular sides.
If (and only if) the length of each pair of sides is greater than the third side, then it is possible to make a triangle.