Other tags that relate to Matchsticks
Triangles. Arithmetic sequences. Visualising. Practical Activity. Investigations. Matchsticks. Generalising. Tangram. Working systematically. Cubes & cuboids.There are 57 results
Broad Topics > Angles, Polygons, and Geometrical Proof > Triangles
Folding Flowers 2
Age 7 to 11
Challenge Level
Make a flower design using the same shape made out of different sizes of paper.
Regular Rings 1
Age 7 to 11
Challenge Level
Can you work out what shape is made by folding in this way? Why not create some patterns using this shape but in different sizes?
Uncanny Triangles
Age 7 to 11
Challenge Level
Can you help the children find the two triangles which have the lengths of two sides numerically equal to their areas?
Putting Two and Two Together
Age 7 to 11
Challenge Level
In how many ways can you fit two of these yellow triangles together? Can you predict the number of ways two blue triangles can be fitted together?
Sticks and Triangles
Age 7 to 11
Challenge Level
Using different numbers of sticks, how many different triangles are you able to make? Can you make any rules about the numbers of sticks that make the most triangles?
Constructing Triangles
Age 11 to 14
Challenge Level
Generate three random numbers to determine the side lengths of a triangle. What triangles can you draw?
Nine-pin Triangles
Age 7 to 11
Challenge Level
How many different triangles can you make on a circular pegboard that has nine pegs?
Egyptian Rope
Age 7 to 11
Challenge Level
The ancient Egyptians were said to make right-angled triangles using a rope with twelve equal sections divided by knots. What other triangles could you make if you had a rope like this?
Cut it Out
Age 7 to 11
Challenge Level
Can you dissect an equilateral triangle into 6 smaller ones? What number of smaller equilateral triangles is it NOT possible to dissect a larger equilateral triangle into?
Inside Seven Squares
Age 7 to 11
Challenge Level
What is the total area of the four outside triangles which are outlined in red in this arrangement of squares inside each other?
Making Maths: Test the Strength of a Triangle
Age 7 to 11
Challenge Level
Have you noticed that triangles are used in manmade structures? Perhaps there is a good reason for this? 'Test a Triangle' and see how rigid triangles are.
Tessellating Triangles
Age 7 to 11
Challenge Level
Can you make these equilateral triangles fit together to cover the paper without any gaps between them? Can you tessellate isosceles triangles?
Name That Triangle!
Age 7 to 11
Challenge Level
Can you sketch triangles that fit in the cells in this grid? Which ones are impossible? How do you know?
Tetrahedra Tester
Age 11 to 14
Challenge Level
An irregular tetrahedron is composed of four different triangles. Can such a tetrahedron be constructed where the side lengths are 4, 5, 6, 7, 8 and 9 units of length?
Peg and Pin Boards
Age 5 to 11
This article for teachers suggests activities based on pegboards, from pattern generation to finding all possible triangles, for example.
Triangle Pin-down
Age 7 to 11
Challenge Level
Use the interactivity to investigate what kinds of triangles can be drawn on peg boards with different numbers of pegs.
Triangle Relations
Age 7 to 11
Challenge Level
What do these two triangles have in common? How are they related?
More Transformations on a Pegboard
Age 7 to 11
Challenge Level
Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.
Rectangle Tangle
Age 7 to 11
Challenge 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?
Bracelets
Age 7 to 11
Challenge Level
Investigate the different shaped bracelets you could make from 18 different spherical beads. How do they compare if you use 24 beads?
Tessellating Transformations
Age 7 to 11
Challenge Level
Can you find out how the 6-triangle shape is transformed in these tessellations? Will the tessellations go on for ever? Why or why not?
Counting Triangles
Age 11 to 14
Challenge Level
Triangles are formed by joining the vertices of a skeletal cube. How many different types of triangle are there? How many triangles altogether?
Cutting Corners
Age 7 to 11
Challenge Level
Can you make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?
Jig Shapes
Age 5 to 11
Challenge Level
Can you each work out what shape you have part of on your card? What will the rest of it look like?
Triangle Shapes
Age 5 to 11
Challenge Level
This practical problem challenges you to create shapes and patterns with two different types of triangle. You could even try overlapping them.
Cut and Make
Age 7 to 11
Challenge Level
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?
Cutting it Out
Age 5 to 11
Challenge Level
I cut this square into two different shapes. What can you say about the relationship between them?
Possible Pairs
Age 7 to 11
Challenge Level
In this game, you turn over two cards and try to draw a triangle which has both properties.
Triangle Island
Age 7 to 11
Challenge Level
You have pitched your tent (the red triangle) on an island. Can you move it to the position shown by the purple triangle making sure you obey the rules?
Part the Polygons
Age 7 to 11 Short
Challenge Level
Draw three straight lines to separate these shapes into four groups - each group must contain one of each shape.
Tri-five
Age 7 to 11
Challenge Level
Find all the different shapes that can be made by joining five equilateral triangles edge to edge.
Fraction Fascination
Age 7 to 11
Challenge Level
This problem challenges you to work out what fraction of the whole area of these pictures is taken up by various shapes.
Triangular Tantaliser
Age 11 to 14
Challenge Level
Draw all the possible distinct triangles on a 4 x 4 dotty grid. Convince me that you have all possible triangles.
Cartesian Isometric
Age 7 to 11
Challenge Level
The graph below is an oblique coordinate system based on 60 degree angles. It was drawn on isometric paper. What kinds of triangles do these points form?
Trice
Age 11 to 14
Challenge Level
ABCDEFGH is a 3 by 3 by 3 cube. Point P is 1/3 along AB (that is AP : PB = 1 : 2), point Q is 1/3 along GH and point R is 1/3 along ED. What is the area of the triangle PQR?
Triangles All Around
Age 7 to 11
Challenge Level
Can you find all the different triangles on these peg boards, and find their angles?
Sorting Logic Blocks
Age 5 to 11
Challenge Level
This activity focuses on similarities and differences between shapes.
Number the Sides
Age 7 to 11
Challenge Level
The triangles in these sets are similar - can you work out the lengths of the sides which have question marks?
Property Chart
Age 11 to 14
Challenge 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 14
Challenge 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...
Isosceles Triangles
Age 11 to 14
Challenge Level
Draw some isosceles triangles with an area of $9$cm$^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?
Making Maths: Equilateral Triangle Folding
Age 7 to 14
Challenge Level
Make an equilateral triangle by folding paper and use it to make patterns of your own.
Triangle Transformation
Age 7 to 14
Challenge Level
Start with a triangle. Can you cut it up to make a rectangle?
Dotty Triangles
Age 11 to 14
Challenge Level
Imagine an infinitely large sheet of square dotty paper on which you can draw triangles of any size you wish (providing each vertex is on a dot). What areas is it/is it not possible to draw?
Transformations on a Pegboard
Age 7 to 11
Challenge Level
How would you move the bands on the pegboard to alter these shapes?
Ratty
Age 11 to 14
Challenge Level
If you know the sizes of the angles marked with coloured dots in this diagram which angles can you find by calculation?
NRICH is part of the family of activities in the Millennium Mathematics Project.