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# What is the Latus Rectum of a Parabola?

In geometry, a parabola is a two-dimensional, mirror-symmetrical curve, which is modeled by a quadratic equation. Any point, line or object reflecting upon itself in a parabolic fashion is said to be its axis of symmetry. The latus rectum of a parabola is the chord of the parabola that passes through the vertex and is perpendicular to theaxis of symmetry.

Latus rectum derives its name from Latin, in which "latus" means "wide" or "broad," and "rectum" means "straight." The latus rectum is sometimes also called the director chord. It is the longest chord within the curve of any given parabola and can be used to calculate other important points and measurements related to the parabola. For instance, the length of the latus rectum can be used to calculate the focal length of the parabola.

The latus rectum can be found by constructing a right triangle within the curve of a parabola using the vertex and any other point on the curve. The altitude (perpendicular height) of this right triangle will be equal to half the length ofthe latus rectum. The length of the latus rectum can also be calculated using the following equation:

Latus Rectum = 4a

Where "a" represents half the distance between the focus and directrix of a given parabola.

In conclusion, the latus rectum is an important tool for understanding and calculating measurements related to aparabola's geometry. By constructing a right triangle within the curve of a parabola and using simple mathematical equations, one can determine not only the length ofthe latus rectum but also other vital information about the shape and function ofthe parabola itself.

## FAQ

### What is the latus rectum of parabola in simple terms?

The latus rectum of a parabola is the perpendicular line segment from the vertex to the directrix. In other words, it is the length of the "chord" of the parabola that goes through the vertex. The latus rectum is used to define the focus of a parabola. The focus is the point on the parabola where all the rays of light converge. The latus rectum is also used to define the directrix of a parabola. The directrix is the line that is perpendicular to the latus rectum and passes through the focus.

### How do you write the latus rectum?

The latus rectum is denoted by the symbol "l." To write it, simply put the symbol "l" followed by the equation of the parabola. For example, if the equation of the parabola is y = x2 + 2x + 1, then the latus rectum would be written as l = y = x2 + 2x + 1.

### How do you find the equation of a parabola with latus rectum?

To find the equation of a parabola with latus rectum, simply substitute the value of the latus rectum into the equation of the parabola. For example, if the latus rectum is l = y = x2 + 2x + 1, then the equation of the parabola would be y = (x-1)2 + 1.