This diagram is an example. The bolded lines are the lines you should draw.
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Note: The top solid lines should be drawn, and the dashed lines on the bottom would be drawn, also. The slashes are just filling.
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7 squares is forty nine so you remove two toothpicks to make the digits 49
9 squares = 18 triangles * * * * * The correct answer is 76. There are 9 points in the grid. You can pick any 3 out of these 9 points in 9*8*7/(3*2*1) = 84 ways. However, 3 will form horizontal lines in the grid, 3 will form vertical lines in the grid, and 2 will form diagonal lines in the grid. None of these 8 triplets will form triangles, but all the rest will. So the answer is 84-8=76.
In general, a regular n-gon has n lines of symmetry (for odd n, each line goes through a vertex and the side opposite; for even n, half the lines go through two opposite vertices and half go through two opposite sides). A regular heptagon has 7 lines of symmetry. It has 7 symmetrical lines
No. The two closest squares are 49 and 36. The square root of 49 being 7 and the square root of 36 being 6. you can conclude that the square root of 42 isn't a perfect square, but it's square root is between 7 and 6.
depends on the position of the points if points are collinear, we have just only one line, the minimum number. If points are in different position (if any of the two points are not collinear) we have 21 lines (7C2), the maximum number of lines.