Angle between two lines

The angle between two lines can be found using the slope of each line. If the slopes of the lines are m1 and m2, then the angle between the lines is given by the formula: θ = arctan(|(m1 – m2)/(1 + m1*m2)|) where arctan is the inverse tangent function. Note that the absolute value is…

Their Foci

In analytical geometry, the foci are points that are used to define the shape of an ellipse or a hyperbola. For an ellipse, the foci are two fixed points inside the ellipse such that the sum of the distances from any point on the ellipse to the two foci is a constant. This constant is…

Parametric equations of a circle

A circle with center (a,b) and radius r can be parameterized using the following parametric equations: x = a + r cos(t) y = b + r sin(t) where t is the parameter that ranges from 0 to 2π. These equations describe the position of any point on the circle in terms of its angle…

Lines through the point of intersection of two given lines

To find the equation of a line passing through the point of intersection of two given lines, you can follow these steps: Note: If the two given lines are parallel, they will never intersect, and there will be no point of intersection. In this case, it is not possible to find a line passing through…

Two dimensions: Cartesian coordinates

Analytical geometry in two dimensions is the branch of mathematics that deals with the study of geometric shapes using algebraic methods. The Cartesian coordinate system is the most common system used in analytical geometry, and it allows us to represent points, lines, curves, and other geometric figures using numerical values. In the Cartesian coordinate system,…

Total probability

The total probability theorem is a fundamental concept in probability theory that allows us to calculate the probability of an event by conditioning on other events. The theorem states that if we have a set of events {A1, A2, A3, …, An} that are mutually exclusive and exhaustive, meaning that one and only one of…