Intersection Of A Circle And A Line
Akopọ
A straight line can slice through a circle at two points, just touch it at one, or miss it entirely. Which of these happens is decided by a single number from the quadratic you get when you combine their equations: the discriminant. This is coordinate geometry meeting the algebra of quadratics in a satisfying way.
In this lesson you will work with the equation of a circle \((x-a)^2+(y-b)^2=r^2\), substitute a line into it, and use the discriminant of the resulting quadratic to decide whether the line is a chord (two points), a tangent (one point) or misses the circle (none). One calculation settles the geometry.
Awọn Afojusun
- Know and use the equation of a circle with centre (a, b) and radius r.
- Solve problems involving the intersection of a circle and a straight line.
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Oriire fun ipari ẹkọ lori Intersection Of A Circle And A Line. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
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- The equation of a circle with centre (a, b) and radius r is: A. (x - a)^2 + (y - b)^2 = r B. (x - a)^2 + (y - b)^2 = r^2 C. x^2 + y^2 = r D. (x + a)^2 + (y + b)^2 = r^2 Answer: B
- When a line is substituted into a circle, what does a discriminant of zero mean? A. The line is a chord B. The line is a tangent C. The line misses the circle D. The circle has no centre Answer: B
- For y = x + 1 and x^2 + y^2 = 25, the quadratic in x is x^2 + x - 12 = 0. Its discriminant is: A. -49 B. 1 C. 47 D. 49 Answer: D
- If the discriminant of the combined quadratic is negative, the line: A. Cuts the circle at two points B. Touches the circle C. Misses the circle D. Passes through the centre Answer: C
- A line cuts a circle at two points. The line is called a: A. Tangent B. Radius C. Chord D. Diameter Answer: C
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