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The compass needles are both magnets on very free suspensions. Bring two of them together, and they forget all about the earth's magnetic field, and they instantly swing to point at each other.
You will need... A set of compasses (for drawing the circle), and a straight edge. First, draw the circle. Then - put the point of the the compasses on the line. Mark the circle where the pencil crosses it. Place the point on this intersection and repeat the action until you're back at your starting point. Now - using the straight edge, join every alternate point to each other - forming an equilateral triangle.
Yes, a line and a point can be on the same line. A point can be placed on a line. It will then be collinear.
Where the decimal is placed you just have to bring it straight down.
When you multiply decimals, the decimal point is placed in the product.