The center of a figure can be found in several ways, watching what data on her are already known. It is worth investigating finding of the center of a circle which is set of the points which are located equally spaced from the center as this figure - one of the most widespread.
It is required to you
- - square;
- - ruler.
Instruction
1. The simplest way to find the center of a circle is to bend the sheet of paper on which it is a nacherchena, having made sure, looking at a gleam that it developed precisely in half. Then bend a leaf perpendicular to the first bend. So you receive diameters which point of intersection is the center of a figure.
2. Of course, this way is ideal, only if a circle of a nacherchen on paper, rather thin that it was possible to look at a gleam whether the leaf is precisely difficult.
3. Let's say the considered figure was drawn on a firm, inflexible surface or it is a separate detail which also does not give in to a bend. To find the center of a circle in this case, you need a ruler.
4. Diameter is the longest piece connecting 2 points of a circle. It is known that it passes through the center therefore the problem of finding of the center of a circle comes down to finding of diameter and its middle.
5. Impose a ruler on a circle then record a zero mark in any point of a figure. Apply a ruler to a circle, having received a secant, and then move towards the center of a figure. Length of a secant will increase, will not be at the peak end of the resources yet. You receive diameter, and having found its middle, will find also the center of a circle.
6. The center of a circumscribed circle for any triangle is located on crossing of median perpendiculars. In case the triangle rectangular, its center always coincides with the middle of a hypotenuse. That is the decision is in construction in a circle of a rectangular triangle with the tops lying on a circle.
7. As a cliche for a right angle the school or construction square, a line or even the sheet of paper/cardboard can serve. Place top of a right angle in any point of a circle, make marks in those places where sides of angle cross circle border, connect them. At you diameter – a hypotenuse turned out.
8. Find the same way one more diameter, the place of crossing of two such pieces and will be the center of a circle.