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圆的面积这节教材主要是讲圆面积计算公式的推导及其应用。通过教学,要使学生理解并掌握求圆面积的公式,并能运用公式求圆的面积和解决有关实际问题。在学习本节知识时,学生容易出现这样几个问题:一、常把半径的二次方当作半径×2,混淆圆面积与圆周长的计算公式;二、当已知直径或圆周长求圆面积时,不能熟练、灵活运用公式;三、对圆面积单位难于理解,往往与圆周长单位混为一谈。针对这些问题,我觉得教学时应该注意:
The area of the circle This section of the textbook is mainly about the derivation and application of the formula for calculating the area of a circle. Through teaching, students should understand and grasp the formula for finding the area of a circle, and use the formula to find the area of a circle and solve practical problems. In learning this section knowledge, students prone to such a few problems: First, often the radius of the quadratic as a radius × 2, the confusion of area and circumference of the circular formula; Second, when the known diameter or circumference Circular area, can not be skilled, flexible use of formulas; Third, the circular area unit difficult to understand, often confused with the circumference of the unit. In response to these problems, I think teaching should pay attention to: