# Loci

## Overview

Welcome to the General Mathematics course material on Loci. Loci are fundamental concepts in geometry that deal with the set of all points that satisfy a particular condition or set of conditions. Understanding loci is crucial in various mathematical applications as they help describe the paths, shapes, and relationships between points and objects in a geometric system.

One of the main objectives of this topic is to identify and interpret loci relating to parallel lines, perpendicular bisectors, angle bisectors, and circles. Let's delve into some key aspects of loci to aid in achieving this objective.

Parallel Lines: When considering the locus of points equidistant from two parallel lines, we find a line that is equidistant from both given lines. This locus forms a new line that runs parallel to the given lines. Understanding this concept is crucial in various applications, such as in construction and design where parallelism plays a significant role.

Perpendicular Bisectors: The locus of points equidistant from the endpoints of a line segment forms a perpendicular bisector. This perpendicular bisector intersects the line segment at a right angle, dividing it into two equal parts. This property is essential in geometry, particularly in the study of triangles and quadrilaterals.

Angle Bisectors: When exploring the locus of points equidistant from the sides of an angle, we encounter the angle bisector. The angle bisector divides the angle into two equal angles. This concept is vital in trigonometry and geometry, especially in the construction of triangles and angles.

Circles: Circles are a special case of loci where all points are equidistant from a central point, forming a circular shape. Understanding the properties of circles, such as radius, diameter, circumference, and area, is essential in various real-world applications involving curves and circular objects.

By examining and understanding these loci, you will be able to analyze geometric figures, solve complex problems involving angles and lines, and develop critical thinking skills necessary for advanced mathematical concepts. Stay engaged and practice applying these concepts to enhance your geometry and trigonometry skills.

## Objectives

1. Identify and interpret Loci Relating to Parallel Lines
2. Circles
3. Perpendicular Bisectors
4. Angle Bisectors

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## Lesson Evaluation

Congratulations on completing the lesson on Loci. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.

You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.

Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.

1. What is the definition of a locus in geometry? A. A point equidistant from two given points B. A set of points satisfying a given condition C. A line that intersects two other lines at right angles D. A quadrilateral with four equal sides Answer: A set of points satisfying a given condition
2. Which of the following is an example of a locus defined by perpendicular bisectors? A. Set of points equidistant from two fixed points B. Set of points equidistant from a fixed line C. Set of points equidistant from two fixed lines D. Set of points equidistant from two fixed planes Answer: Set of points equidistant from a fixed line
3. When considering loci related to circles, what defines the locus of points equidistant from the center of the circle? A. A line B. A circle C. A parabola D. An ellipse Answer: A circle
4. What type of locus is formed by the set of points equidistant from two intersecting lines? A. Circle B. Parabola C. Hyperbola D. Conic section Answer: Bisector of the angle formed by the two lines
5. For a locus related to parallel lines, what kind of line would be traced out by a point moving parallel to a given line? A. Line segment B. Perpendicular line C. Parallel line D. Ray Answer: Parallel line
6. What is the locus of points equidistant from two non-intersecting lines? A. Perpendicular bisector B. Parallel line C. Circle D. Parabola Answer: Parallel line
7. When considering loci, what does the locus of points equidistant from a point refer to? A. A circle B. A line C. A parabola D. An ellipse Answer: A circle
8. In a locus defined by angle bisectors of a triangle, what type of triangle is formed by the intersection of these bisectors? A. Equilateral triangle B. Isosceles triangle C. Scalene triangle D. Right triangle Answer: Equilateral triangle
9. What locus is defined by points equidistant from the sides of a triangle? A. Incircle B. Circumcircle C. Excircle D. Nine-point circle Answer: Circumcircle
10. What type of locus is formed when considering points equidistant from a given line segment? A. Perpendicular bisector B. Angle bisector C. Median line D. Altitude line Answer: Perpendicular bisector

## Past Questions

Wondering what past questions for this topic looks like? Here are a number of questions about Loci from previous years

Question 1

In the diagram above, AO is perpendicular to OB. Find x

Question 1

The locus of points equidistant from a fixed point.

Practice a number of Loci past questions