如果点 (x, y) 与 (3, 6) 和 (-3, 4) 等距,则求 x 和 y 之间的关系
几何是最古老的数学领域之一,有着广泛的应用和对我们日常生活的影响。几何学是一门数学学科,它研究我们环境中许多物体的比例、大小、尺寸、形式、形状和角度。我们周围的所有物体都有独特的形状,占据了大量的空间,可以用来存储特定数量的物品,并且可能以各种方式定位。几何包含所有这些变量。二维和三维形状是两种形状。
笛卡尔平面
坐标平面和笛卡尔坐标系是几何学中最重要的两个主题。当一根水平线和一根垂直线连接起来形成四个象限时,就形成了一个笛卡尔平面或坐标平面。每个象限可以表示不同的点。每个象限的坐标可用于表示不同的点。
距离公式
计算两个给定点在笛卡尔平面上的距离时使用距离公式。下图显示了点 A(a, b) 和 B(p, q)。为了计算它们之间的距离,我们需要找到长度 AB。勾股定理可以方便地应用以计算所需的长度。事实上,距离公式是勾股定理的直接应用。
笛卡尔平面上任意两点 A(a, b) 和 B(p, q) 之间的距离由下式给出:
D =
因此,笛卡尔平面上两点之间的距离等于它们各自的 x 和 y 坐标之差的平方和的总和的平方根。
如果点 (x, y) 与 (3, 6) 和 (-3, 4) 等距,则求 x 和 y 之间的关系
解决方案:
Given: Point P(x, y) is equidistant from both A(3, 6) and B(-3, 4).
Using distance formula, distance between P(x, y) and A(3, 6) is given by:
D1 =
Using distance formula, distance between P(x, y) and B(-3, 4) is given by:
D2 =
Since it is given that D1 = D2, we have:
Square both sides. Then,
x2 + 9 – 6x + y2 + 36 – 12y = x2 + 9 + 6x + y2 + 16 – 8y
⇒ 12x + 4y = 20
⇒ 3x + y = 5
⇒ 3x + y – 5 = 0
类似问题
问题 1. 如果点 (0, 1) 与 (x, 6) 和 (5, -3) 等距,求 x?
解决方案:
Given: Point P(0, 1) is equidistant from both A(x, 6) and B(5, -3).
Using distance formula, distance between P(0, 1) and A(x, 6) is given by:
D1 =
Using distance formula, distance between P(0, 1) and B(5, -3) is given by:
D2 =
Since it is given that D1 = D2, we have:
Square both sides. Then,
x = −4
问题 2. 如果点 (x, y) 与 (1, 2) 和 (3, 5) 等距,则 X 和 Y 之间的关系是什么?
解决方案:
Given: Point P(x, y) is equidistant from both A(1, 2) and B(3, 5).
Using distance formula, distance between P(x, y) and A(1, 2) is given by:
D1 =
Using distance formula, distance between P(x, y) and B(3, 5) is given by:
D2 =
Since it is given that D1 = D2, we have:
Square both sides. Then,
x2 + 1 – 2x + y2 + 4 – 4y = x2 + 9 – 6x + y2 + 25 – 10y
⇒ 6x – 2x + 10y – 4y = 9 – 1 + 25 – 4
⇒ 4x + 6y = 29
问题 3. 如果点 P(2, – 3) 和 Q(10, y) 之间的距离为 10 个单位,则求 y。
解决方案:
Given: PQ = 10 units
Using distance formula, we have:
⇒
Square both sides.
⇒ 64 + (y +3)2 = 100
⇒ (y +3)2 = 36
⇒ y = 3 or −9
问题 4. 如果点 (x, y) 与 (3, 6) 和 (-3, 5) 等距,那么 X 和 Y 之间的关系是什么?
解决方案:
Given: Point P(x, y) is equidistant from both A(3, 6) and B(-3, 5).
Using distance formula, distance between P(x, y) and A(3, 6) is given by:
D1 =
Using distance formula, distance between P(x, y) and B(-3, 5) is given by:
D2 =
Since it is given that D1 = D2, we have:
Square both sides. Then,
x2 + 9 – 6x + y2 + 36 – 12y = x2 + 9 + 6x + y2 + 25 – 10y
⇒ 6x + 6x + 12y – 10y = 36 – 25
⇒ 12x + 2y = 11
问题 5. 如果点 (x, y) 与 (3, 6) 和 (-3, 2) 等距,那么 X 和 Y 之间的关系是什么?
解决方案:
Given: Point P(x, y) is equidistant from both A(3, 6) and B(-3, 2).
Using distance formula, distance between P(x, y) and A(3, 6) is given by:
D1 =
Using distance formula, distance between P(x, y) and B(-3, 2) is given by:
D2 =
Since it is given that D1 = D2, we have:
Square both sides. Then,
x2 + 9 – 6x + y2 + 36 – 12y = x2 + 9 + 6x + y2 + 4 – 4y
⇒ 12x – 8y = -32
⇒ 3x – 2y = -8