An isosceles trapezium is like a slice through an isosceles triangle. The two sides of an isosceles trapezium are of equal length. It is like a slice through a right-angled triangle.Īn isosceles trapezium is one where the two sides make the same angle to the base (but with opposite directions of slope). Right-angled trapeziumĪ right-angled trapezium is a trapezium where one of the angles at the base is a right angle. Notice that one side slopes inwards, and one slopes outwards. It is like a slice through an obtuse triangle. Obtuse trapeziumĪn obtuse trapezium is a trapezium where one of the angles at the base is obtuse (that is, greater than 90 degrees). Notice that the sides slope in opposite directions. It is like a slice through an acute triangle. Acute trapeziumĪn acute trapezium is a trapezium where both angles at the base are acute (that is, less than 90 degrees). It is the same shape, just rotated.Ī trapezium is a quadrilateral that has at least two parallel sides If you rotate a rhombus you will see a shape that is sometimes called a diamond. The diagonally opposite angles of a rhombus are equal. You can think of a rhombus as a 'pushed-over' square.Ī rhombus is a special type of parallelogram where all four sides are equal. RhombusĪ rhombus is a quadrilateral where all four sides are the same length, and both pairs of opposite sides are parallel. The diagonally opposite angles are equal.Ī rectangle is a special type of parallelogram where all 4 angles are 90 degrees. The opposite sides of a parallelogram have equal lengths. You can think of a parallelogram as a 'pushed-over' rectangle. ParallelogramĪ parallelogram is a quadrilateral where both pairs of opposite sides are parallel. The opposite sides of a rectangle are always equal.Ī square is a special type of rectangle, where all four sides are equal. RectangleĪ rectangle is a quadrilateral that has all four angles equal to 90 degrees. The square angle symbols in the corners indicate that each corner is a 90-degree angle.

The tick marks on the four sides indicate that the sides are the same length. Here is a video about quadrilaterals SquareĪ square is a quadrilateral where all four sides are equal, and all four angles are 90 degrees There are various types of quadrilaterals that have special names: The interior angles of any quadrilateral add up to 360 degrees. A quadrilateral is a shape with four straight sides.

Four sided shape called