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There are 51 NRICH Mathematical resources connected to Quadrilaterals, you may find related items under Angles, Polygons, and Geometrical Proof.

### Shape Draw

##### Age 7 to 11Challenge Level

Use the information on these cards to draw the shape that is being described.

### Poly Plug Rectangles

##### Age 5 to 14Challenge Level

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?

##### Age 14 to 16Challenge Level

Explore when it is possible to construct a circle which just touches all four sides of a quadrilateral.

### Overlaps

##### Age 5 to 7Challenge Level

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

##### Age 7 to 11Challenge Level

These rectangles have been torn. How many squares did each one have inside it before it was ripped?

### Trapezium Four

##### Age 14 to 16Challenge Level

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

##### Age 14 to 16Challenge Level

Can you find the area of a parallelogram defined by two vectors?

### Property Chart

##### Age 11 to 14Challenge Level

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

##### Age 11 to 14Challenge Level

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...

##### Age 11 to 14Challenge Level

A game for 2 or more people, based on the traditional card game Rummy.

##### Age 7 to 11Challenge Level

This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!

### Transformations on a Pegboard

##### Age 7 to 11Challenge Level

How would you move the bands on the pegboard to alter these shapes?

### A Cartesian Puzzle

##### Age 7 to 11Challenge Level

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

##### Age 7 to 11Challenge Level

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

##### Age 7 to 11Challenge Level

Can you draw a square in which the perimeter is numerically equal to the area?

##### Age 7 to 11Challenge Level

How many DIFFERENT quadrilaterals can be made by joining the dots on the 8-point circle?

##### Age 16 to 18Challenge Level

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?

##### Age 14 to 16Challenge Level

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

##### Age 7 to 11Challenge Level

Investigate the different shaped bracelets you could make from 18 different spherical beads. How do they compare if you use 24 beads?

### Triangle Transformation

##### Age 7 to 14Challenge Level

Start with a triangle. Can you cut it up to make a rectangle?

### Folding Flowers 1

##### Age 7 to 11Challenge Level

Can you visualise what shape this piece of paper will make when it is folded?

### An Equilateral Triangular Problem

##### Age 11 to 14Challenge Level

Take an equilateral triangle and cut it into smaller pieces. What can you do with them?

##### Age 11 to 14Challenge Level

We started drawing some quadrilaterals - can you complete them?

##### Age 11 to 14Challenge Level

How many questions do you need to identify my quadrilateral?

### What Am I?

##### Age 7 to 11Challenge Level

Can you draw the shape that is being described by these cards?

### Opposite Vertices

##### Age 11 to 14Challenge Level

Can you recreate squares and rhombuses if you are only given a side or a diagonal?

##### Age 7 to 11Challenge Level

A task which depends on members of the group noticing the needs of others and responding.

### Square Pair

##### Age 16 to 18Challenge Level

Explore the shape of a square after it is transformed by the action of a matrix.

##### Age 14 to 16Challenge Level

Investigate the properties of quadrilaterals which can be drawn with a circle just touching each side and another circle just touching each vertex.

### Cutting it Out

##### Age 5 to 11Challenge Level

I cut this square into two different shapes. What can you say about the relationship between them?

### Rabbit Run

##### Age 7 to 11Challenge Level

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

##### Age 7 to 11Challenge Level

Billy's class had a robot called Fred who could draw with chalk held underneath him. What shapes did the pupils make Fred draw?

##### Age 16 to 18Challenge Level

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.

### Folding

##### Age 7 to 11Challenge Level

What shapes can you make by folding an A4 piece of paper?

##### Age 11 to 16

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

##### Age 11 to 14Challenge Level

How many differently shaped rectangles can you build using these equilateral and isosceles triangles? Can you make a square?

##### Age 14 to 16Challenge Level

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?

##### Age 11 to 14Challenge Level

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?

##### Age 14 to 16Challenge Level

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

##### Age 7 to 11Challenge Level

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

##### Age 14 to 16Challenge Level

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. . . .

### Strange Rectangle 2

##### Age 16 to 18Challenge Level

Find the exact values of some trig. ratios from this rectangle in which a cyclic quadrilateral cuts off four right angled triangles.

### Strange Rectangle

##### Age 16 to 18Challenge Level

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

##### Age 14 to 16Challenge Level

What can you say about the lengths of the sides of a quadrilateral whose vertices are on a unit circle?

### Lawnmower

##### Age 14 to 16Challenge Level

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. . . .

### Biggest Bendy

##### Age 16 to 18Challenge Level

Four rods are hinged at their ends to form a quadrilateral. How can you maximise its area?

### Set Square

##### Age 16 to 18Challenge Level

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

##### Age 7 to 11 ShortChallenge Level

Draw three straight lines to separate these shapes into four groups - each group must contain one of each shape.

### Is a Square a Rectangle?

##### Age 7 to 11Challenge Level

How many rectangles can you find in this shape? Which ones are differently sized and which are 'similar'?