Parameter equation mainly examines the calculation method of ballistic equation, the maximum value of triangle substitution, the transformation between polar coordinate equation and rectangular coordinate equation, etc. The probability problem is relatively simple, and it is also a problem that must be scored. This problem mainly includes frequency distribution table, frequency distribution histogram, solution of regression equation, probability calculation, calculation of correlation coefficient and so on. Mainly about the ability to draw and read maps.
The Pythagorean Theorem of Triangle and the proof questions about triangle are easy to make mistakes when demonstrating the congruence and similarity of triangle. Note that SSA cannot prove that two triangles are identical.
A circle includes an arc, a chord, a circumferential angle, etc. , and related formulas and their variants, which are basic. There are two situations in which a circle is tangent to a circle: inscribed circle and circumscribed circle. There are also two situations when two circles intersect: the center of the circle is on the same side and the center of the circle is opposite to the common chord. Secondly, the theorem of circle angle is the key point. The fillet opposite to the same arc (equal arc) is flat, the fillet opposite to the diameter is a right angle, the chord opposite to the fillet at 90 degrees is the diameter, and the fillet opposite to the arc is equal to half of the fillet opposite to it.