1. Prepare a blank drawing paper and draw a circle in the center of the drawing paper.
2. Draw the patterns you want around the circle, such as the sun and flowers.
3. Write what you want to express in the circle, such as "circle and life" and "wonderful circle".
Finally, add some decorative patterns on the edge of drawing paper to make the whole handwritten newspaper look more beautiful.
The nature of the circle:
1, the circle is an axisymmetric figure, and its symmetry axis is an arbitrary straight line passing through the center of the circle. A circle is also a central symmetric figure, and its symmetric center is the center of the circle. Vertical diameter theorem: the diameter perpendicular to the chord bisects the chord and bisects the two arcs opposite the chord. Inverse theorem of vertical diameter theorem: bisecting the diameter of a chord (not the diameter) is perpendicular to the chord and bisecting two arcs opposite to the chord.
2. About the properties and theorems of central angle and central angle: If two central angles, two central angles, two groups of arcs and two chords have the same quantity in the same circle or an equal circle, then their corresponding other quantities are all equal. In the same circle or equal circle, the circumferential angle of an equal arc is equal to half the central angle of the arc.
3. On the properties and theorems of circumscribed circle and inscribed circle: A triangle has unique circumscribed circle and inscribed circle. The center of the circumscribed circle is the intersection of the perpendicular lines of each side of the triangle, and the distances to the three vertices of the triangle are equal; The center of the inscribed circle is the intersection of the bisectors of the inner angles of the triangle, and the distances to the three sides of the triangle are equal.
4. If two circles intersect, the line segment connecting the centers of the two circles (or a straight line can be used) bisects the common chord vertically.
5. The degree of the chord tangent angle is equal to half the degree of the arc it clamps.
6. The degree of the angle inside a circle is equal to half of the sum of the degrees of the arc opposite to this angle.
7. The degree of the outer angle of a circle is equal to half the difference between the degrees of two arcs cut by this angle.
8. The circumference is equal, and the area of a circle is larger than that of a square, rectangle or triangle.