28.5 units
Not normally but quite possible in the form of an isosceles trapezoid.
Three (if it happens to also be an equilateral triangle).If it's isosceles but not equilateral, it has only one line of symmetry.
It is possible if neither of the angles in the triangle measures to 60 degrees
No. A trapezoid has two parallel sides. This is not possible in a concave quadrilateral.
yes it is possible to do that.
Not normally but quite possible in the form of an isosceles trapezoid.
Yes its quite possible to have an isosceles trapezoid which will have 2 equal base angles and 2 equal angles above which all add up to 360 degrees.
No its parallel bases can never be equal in length. But if it is in the form of an isosceles trapezoid then its slanted sides are equal in length.
Yes, a trapezoid may have two lines of symmetry, but the trapezoid must also be a rectangle.If the trapezoid is not also a rectangle, the the most symmetry lines it can have possible is 1 (this can only occur it's an isosceles trapezoid.)
Three (if it happens to also be an equilateral triangle).If it's isosceles but not equilateral, it has only one line of symmetry.
Although it is possible to have an isosceles trapezoid with congruent diagonals usually the test of a parallelogram for it to be a rectangle is congruent diagonals.
It is possible if neither of the angles in the triangle measures to 60 degrees
Several solutions are possible here. The four sides could be the same length, or different lengths. The only requirement (with respect to lengths) to be called an "isosceles trapezoid" is that two opposite sides have the same length.Several solutions are possible here. The four sides could be the same length, or different lengths. The only requirement (with respect to lengths) to be called an "isosceles trapezoid" is that two opposite sides have the same length.Several solutions are possible here. The four sides could be the same length, or different lengths. The only requirement (with respect to lengths) to be called an "isosceles trapezoid" is that two opposite sides have the same length.Several solutions are possible here. The four sides could be the same length, or different lengths. The only requirement (with respect to lengths) to be called an "isosceles trapezoid" is that two opposite sides have the same length.
Yes, but they would have to be the pair of sides which are not parallel and, in that case, you will have an isosceles trapezium. It is also possible for these two sides to be congruent with one (but not both) of the remaining sides.
Yes, it is possible to have non-integral values for the valence.
No. A trapezoid has two parallel sides. This is not possible in a concave quadrilateral.
No.