first name the matchsticks as rows and columns. For example r1 indicates the first row, r12 indicates the second matchstick in the first row. Similarly c32 indicates the 2nd matchstick in the 3rd column. Here of course you have to take a reference point. I use the upper left corner.
Now a solution takes the form below:
c11--->c42
r11--->r23
r32--->r33
Light
Potential energy
Think about 3-D shapes.Eight equilateral triangles would form two square based pyramids stuck together.Count all the lines of the shape.It will have twelve lines which would be enough lines for twelve matchsticks.
The energy given off by burning a matchstick is mainly in the form of heat and light. The heat is a result of the exothermic combustion reaction that occurs when the matchstick is ignited, and the light is emitted as a by-product of the combustion process.
Arrange them to form the Roman numeral for 20: XX
matches
Make 4 equally spaced columns of 3 matchsticks. Across the top put the first row of 3 matchsticks and then put a further two rows of matchsticks equally spaced. This will form 9 small equal squares within a larger square.
The possessive form for the plural noun matches is matches'.Example: The matches' box is wet.
The singular possessive form for match is match's.The plural possessive form for the plural noun matches is matches'.
Matches
Make a triangle, each of whose sides is 2 matchsticks long. This uses six matchsticks. Join the middle points of the sides of this triangle to one another - using another three match sticks. You will then have four small triangles and one large one.
The noun 'match' is a countable noun, whether it is a box full or two socks.