The RhombusĪ rhombus is a four-sided shape where all sides have equal length (marked "s").Īlso opposite sides are parallel and opposite angles are equal.Īnother interesting thing is that the diagonals (dashed lines) meet in the middle at a right angle. The SquareĪ square has equal sides (marked "s") and every angle is a right angle (90°)Ī square also fits the definition of a rectangle (all angles are 90°), and a rhombus (all sides are equal length). The little squares in each corner mean "right angle"Ī rectangle is a four-sided shape where every angle is a right angle (90°).Īlso opposite sides are parallel and of equal length. Let us look at each type in turn: The Rectangle Some types are also included in the definition of other types! For example a square, rhombus and rectangle are also parallelograms. There are special types of quadrilateral: They should add to 360° Types of Quadrilaterals Try drawing a quadrilateral, and measure the angles. interior angles that add to 360 degrees:.That is where we will find the matching frame! Try this yourself: There is a picture with four equal sides and no right angles.(Also see this on Interactive Quadrilaterals) Properties That means the most specific category we can choose is a parallelogram. Those are squares! Your first picture has four straight sides, two pairs of parallel sides with different lengths. The last pile is even more specific, with 4 right angles and 4 equal sides. Those are rhombi, or a rhombus if we only have one. Your friend points to a pile of frames that are parallelograms that have four equal sides but no right angles. Some of the parallelograms have right angles, which means they are rectangles. Others have two sets of parallel sides these are parallelograms. Some frames have one set of parallel sides these are trapezoids. All the frames have four straight sides, so we know they are all quadrilaterals. All the frames are sorted into their most specific category of 2D shape, but we still need to sort the pictures. Hanging Pictures We are in art class and need to hang pictures in their matching frames with the same shape. What is the most specific category of shape for the picture? That is where we will find the matching frame! Try this yourself: There is a picture with four equal sides and no right angles.
We are in art class and need to hang pictures in their matching frames with the same shape.
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