C/C++ program to find the vertex, focus and directrix of a parabola
A set of points on a plain surface that forms a curve such that any point on that curve is equidistant from a point in the center (called focus) is a parabola.
The general equation for the parabola is
y = ax<sup>2</sup> + bx + c
The vertex of a parabola is the coordinate from which it takes the sharpest turn whereas a is the straight-line used to generate the curve.
Focus is the point with is equidistant from all points of the parabola.
Here, we will find the vertex, focus, and directrix of a parabola. There is a mathematical formula that finds all these values. And we will make a program using the mathematical formula for it.
Input: a = 10, b = 5, c = 4 Output: The vertex: (-0.25, 3.375) The Focus: (-0.25, 3.4) y-Directrix:-1036
解释
根据给定的抛物线图形的数值,找到顶点、焦点和y方向的数学公式。
顶点 = {(-b/2a) , (4ac-b2/4a)}
焦点 = {(-b/2a), (4ac-b2 1/4a)}
方向 = c - (b2 1)*4a
示例
#include <iostream> using namespace std; int main() { float a = 10, b = 5, c = 4; cout << "The vertex: (" << (-b / (2 * a)) << ", " << (((4 * a * c) - (b * b)) / (4 * a)) << ")\n"; cout << "The Focus: (" << (-b / (2 * a)) << ", " << (((4 * a * c) - (b * b) + 1) / (4 * a)) << ")\n"; cout << "y-Directrix:" << c - ((b * b) + 1) * 4 * a; }
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