What are the main properties of trapezium angles?

The sides and angles of a trapezoid: trapezoid. The bases (top and bottom) of a trapezoid are parallel. That's it. No sides need to be congruent and no angles need to be congruent. Nothing special happens with the diagonals. read more

In an isosceles trapezium, the angle bisectors of the acute angles form an isosceles triangle. In an isosceles trapezium, the angle bisectors of the obtuse angles form an isosceles triangle or reverse trapezium. Join the mid points of an isosceles trapezium, in order, and you get a kite. read more

(g) The sum of the four exterior angles is 4 right angles. (h) The sum of the four interior angles is 4 right angles. (i) One pair of adjacent angles can each be a right angle. The other pair of adjacent angles will be supplementary angles but not right angles. Isosceles trapezium. Its properties are: (a) Two pairs of adjacent angles add up to 180 degrees. read more

If one of the angles of a parallelogram is a right angle then all other angles are right and it becomes a rectangle. Important formulas of parallelograms. Area = L * H; Perimeter = 2(L+B) Rectangles. Properties of a Rectangle. Opposite sides are parallel and congruent. All angles are right. read more