1, the circumference formula of a circle: C=πd=2πr (d is the diameter, r is the radius, π).
2. Formula of circle area: S=πr? (r is the radius, π)
3. The volume formula of the cone: V= 1/3sh= 1/3πr? H (s is the bottom area, h is the height, π)
4. Volume formula of cylinder: V=sh=πr? H (s is the bottom area, h is the height, π)
5. The surface area formula of the cone: S=πrl+πr? (r is the radius and l is the bus length)
6. Surface area formula of cylinder: S=2πrh+2πr? (r is the radius and h is the height)
7. Arc length formula: L=n/ 180πr (n is the central angle, r is the radius, π).
Sixth grade mathematics examination center:
1, fractional multiplication: the meaning of fractional multiplication is the same as integer multiplication, and it is a simple operation to find the sum of several identical addends. The calculation rule of fractional multiplication is: the product of fractional numerator multiplied by integer is numerator, and the denominator remains unchanged; Fractions are multiplied by fractions, the product of numerator multiplication is numerator, and the product of denominator multiplication is denominator, but the denominator of numerator cannot be zero.
2. Meaning of reciprocal: Two numbers whose product is 1 are reciprocal. The concept of reciprocal only makes sense for any two numbers.
3. The concept of circle: A figure composed of all points whose distance from a plane to a fixed point is equal to a fixed length is called a circle. A fixed point is called the center of the circle and a fixed length is called the radius.
4. The circumference of the circle: The length of the curve around the circle is called the circumference of the circle.
5. Area of the circle: The size of the plane occupied by the circle is called the area of the circle.
6. Sector: In a circle with radius r, the central angle of the arc is n, and the sector area it faces is S=n/360πR? .
7. Axisymmetric figure: If a figure is folded along a straight line and the parts on both sides of the straight line can overlap each other, then this figure is called an axisymmetric figure, and this straight line is called an axis of symmetry.
8. Hexagonal prism: A polyhedron is defined as a prism, in which two faces are parallel to each other and the other face is a quadrilateral, and the common edges of every two adjacent quadrilaterals are parallel to each other.