Resources tagged with: Quadrilaterals
There are 58 NRICH Mathematical resources connected to Quadrilaterals, you may find related items under Angles, polygons, and geometrical proof.
Broad Topics > Angles, polygons, and geometrical proof > Quadrilaterals
Seeing Parallelograms
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a parallelogram.
Rhombus It
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a rhombus.
Parallelogram It
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a parallelogram.
Seeing Squares
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
An Equilateral Triangular Problem
Take an equilateral triangle and cut it into smaller pieces. What can you do with them?
Completing Quadrilaterals
We started drawing some quadrilaterals - can you complete them?
Guess my Quad
How many questions do you need to identify my quadrilateral?
Shape Draw
Use the information on these cards to draw the shape that is being described.
Poly Plug Rectangles
The computer has made a rectangle and will tell you the number of spots it uses in total. Can you find out where the rectangle is?
Opposite Vertices
Can you recreate squares and rhombuses if you are only given a side or a diagonal?
Quad Match
A task which depends on members of the group noticing the needs of others and responding.
Circles in Quadrilaterals
Explore when it is possible to construct a circle which just touches all four sides of a quadrilateral.
Overlaps
What does the overlap of these two shapes look like? Try picturing it in your head and then use some cut-out shapes to test your prediction.
Torn Shapes
These rectangles have been torn. How many squares did each one have inside it before it was ripped?
Trapezium Four
The diagonals of a trapezium divide it into four parts. Can you create a trapezium where three of those parts are equal in area?
Areas of Parallelograms
Can you find the area of a parallelogram defined by two vectors?
Property Chart
A game in which players take it in turns to try to draw quadrilaterals (or triangles) with particular properties. Is it possible to fill the game grid?
Shapely Pairs
A game in which players take it in turns to turn up two cards. If they can draw a triangle which satisfies both properties they win the pair of cards. And a few challenging questions to follow...
Quadrilaterals Game
A game for 2 or more people, based on the traditional card game Rummy.
Stringy Quads
This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!
Square It
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
Transformations on a Pegboard
How would you move the bands on the pegboard to alter these shapes?
A Cartesian Puzzle
Find the missing coordinates which will form these eight quadrilaterals. These coordinates themselves will then form a shape with rotational and line symmetry.
Rectangle Tangle
The large rectangle is divided into a series of smaller quadrilaterals and triangles. Can you untangle what fractional part is represented by each of the shapes?
Numerically Equal
Can you draw a square in which the perimeter is numerically equal to the area?
Quadrilaterals
How many DIFFERENT quadrilaterals can be made by joining the dots on the 8-point circle?
Quad in Quad
Join the midpoints of a quadrilateral to get a new quadrilateral. What is special about it?
Flexi Quads
A quadrilateral changes shape with the edge lengths constant. Show the scalar product of the diagonals is constant. If the diagonals are perpendicular in one position are they always perpendicular?
Bendy Quad
Four rods are hinged at their ends to form a convex quadrilateral. Investigate the different shapes that the quadrilateral can take. Be patient this problem may be slow to load.
Bracelets
Investigate the different shaped bracelets you could make from 18 different spherical beads. How do they compare if you use 24 beads?
Rabbit Run
Ahmed has some wooden planks to use for three sides of a rabbit run against the shed. What quadrilaterals would he be able to make with the planks of different lengths?
Fred the Class Robot
Billy's class had a robot called Fred who could draw with chalk held underneath him. What shapes did the pupils make Fred draw?
Flexi Quad Tan
As a quadrilateral Q is deformed (keeping the edge lengths constnt) the diagonals and the angle X between them change. Prove that the area of Q is proportional to tanX.
The Cyclic Quadrilateral
This gives a short summary of the properties and theorems of cyclic quadrilaterals and links to some practical examples to be found elsewhere on the site.
Making Rectangles, Making Squares
How many differently shaped rectangles can you build using these equilateral and isosceles triangles? Can you make a square?
Cyclic Quad Jigsaw
A picture is made by joining five small quadrilaterals together to make a large quadrilateral. Is it possible to draw a similar picture if all the small quadrilaterals are cyclic?
Linkage
Four rods, two of length a and two of length b, are linked to form a kite. The linkage is moveable so that the angles change. What is the maximum area of the kite?
Arrowhead
The points P, Q, R and S are the midpoints of the edges of a non-convex quadrilateral.What do you notice about the quadrilateral PQRS and its area?
Hexagon Transformations
Can you cut a regular hexagon into two pieces to make a parallelogram? Try cutting it into three pieces to make a rhombus!
Dividing the Field
A farmer has a field which is the shape of a trapezium as illustrated below. To increase his profits he wishes to grow two different crops. To do this he would like to divide the field into two trapeziums each of equal area. How could he do this?
Strange Rectangle 2
Find the exact values of some trig. ratios from this rectangle in which a cyclic quadrilateral cuts off four right angled triangles.
Strange Rectangle
ABCD is a rectangle and P, Q, R and S are moveable points on the edges dividing the edges in certain ratios. Strangely PQRS is always a cyclic quadrilateral and you can find the angles.
Long Short
What can you say about the lengths of the sides of a quadrilateral whose vertices are on a unit circle?
Lawnmower
A kite shaped lawn consists of an equilateral triangle ABC of side 130 feet and an isosceles triangle BCD in which BD and CD are of length 169 feet. A gardener has a motor mower which cuts strips of grass exactly one foot wide and wishes to cut the entire lawn in parallel strips. What is the minimum number of strips the gardener must mow?
Biggest Bendy
Four rods are hinged at their ends to form a quadrilateral. How can you maximise its area?
Set Square
A triangle PQR, right angled at P, slides on a horizontal floor with Q and R in contact with perpendicular walls. What is the locus of P?
Part the Polygons
Draw three straight lines to separate these shapes into four groups - each group must contain one of each shape.
Is a Square a Rectangle?
How many rectangles can you find in this shape? Which ones are differently sized and which are 'similar'?
Cut and Make
Cut a square of paper into three pieces as shown. Now,can you use the 3 pieces to make a large triangle, a parallelogram and the square again?