Polygon Exterior Angles Sum . It is isogonal or vertex-transitive: all corners lie within the same symmetry orbit. c) If all the angles of a quadrilateral are equal, it is a rectangle. A parallelogram, the diagonals bisect each other. Answers. The diagonals of a square bisect each other and meet at 90°. Does a parallelogram have two 90 degree angles True or false? A trapezium has one pair of opposite sides parallel. A parallelogram is a quadrilateral made from two pairs of intersecting parallel lines. The opposite … All four sides of a square are equal. The two diagonals of a kite bisect each other at 90 degrees. The diagonals of a rhombus bisect each other at right angles. Gravity. Trapezium. Hence, the formula of the perimeter of a trapezium is given by. 2. This means that they cut each other in half. The area of a parallelogram is the area occupied by it in a two-dimensional plane. Special parallelograms. The opposite sides of a rectangle are equal. All the sides and angles of a scalene trapezium are of different measures. It is also known as an equiangular quadrilateral. Answers. a and b are the length of the first and second pair of the sides of a kite. The diagonals bisect each other at right angles. gudspeling. The angles of a kite are equal whereas the unequal sides of a kite meet. Since all the sides are equal, therefore, Perimeter = 4 x side. All four angles of a square are equal (each being 360°/4 = 90°, a right angle). extra credit. use the converse result to show that the points with co-ordinates (1, 2), (8, -2), (7, 6) and (0, 10) are the verticies of a rhombus, and find its area. Properties of a Rectangle. The legs or non parallel sides of an isosceles trapezium are equal in length. Rhombus: Diagonals bisect each other at 90°. In the figure above drag any vertex to reshape the rhombus and convince your self this is so. All sides are equal and opposite sides are parallel. A rhombus is generally drawn with a side at the bottom, so the … Test. Opposite sides are equal. a quadrilateral where the two diagonals are equal in length and bisect each other a ... (each of 90 degrees). The sum of two adjacent angles is equal to 180°. If one angle is 90 degrees, then all other angles are also 90 degrees. That is, each diagonal cuts the other into two equal parts. The rectangle is a special case of a parallelogram in which measures of its every interior angle is 90 degree. The area of the trapezium can be calculated by taking the average of the two bases of a  trapezium and multiplying by its altitude. Here, a,b,c and d are the sides of the trapezium. Definition: A rectangle is a quadrilateral with four right angles. So if one angle is 90 degrees, the opposite angle is also 90 degrees. diagonals bisect each other at the angle of 90 degree. In the figure above drag any vertex to reshape the parallelogram and convince your self this is so. In any parallelogram, the diagonals (lines linking opposite corners) bisect each other. A parallelogram may also be called a trapezoid as it has two parallel sides. rectangle. 4 1? The legs or non parallel sides of an isosceles trapezium are congruent. It implies that two adjacent angles are supplementary. Each angle of a rectangle is 90°; so,