The first method: use the chord length formula, and the chord length formula is: s=r2? D2. where s is the chord length, r is the radius of the circle, and d is the difference between the two ends of the chord and the center of the circle.
The second method: using the vertical diameter theorem, vertical diameter theorem: the line segment passing through the center of the circle and perpendicular to the chord is called the vertical diameter of the chord. The vertical diameter bisects the chord and bisects the arc corresponding to the chord. Using the vertical diameter theorem to find the chord length, we can first find the length of the vertical diameter, and then multiply the vertical diameter by 2 to get the chord length.
The third method: using tangent theorem, tangent theorem: the line segment passing through the center of the circle and perpendicular to the tangent is called the vertical diameter of the tangent. The vertical diameter of the tangent bisects the tangent. Using the tangent theorem to find the chord length, we can first find the tangent length and then multiply the tangent length by 2 to get the chord length.
The importance of learn mathematics:
1. Mathematics is closely related to our life. To say that the real effect of learning mathematics is not reflected in exam-oriented education, but in my own thinking about the future.
2. The importance of mathematics is self-evident. Mathematics is the foundation of all sciences and an important channel to cultivate logical thinking. It can be said that every major progress of our mankind is strongly supported by mathematics.
3. The application of mathematical knowledge in life is everywhere. From the calculation of daily living costs, to astronomy, geography, quality control, agricultural economy, aerospace, there are shadows of using mathematics.