# Geometry

### Circle

Circle Definition A circle is the set of all points in a plane that are equidistant from a given point that is called the origin. Origin is the center of the circle Radius is the distance from the center to any point on the circle. We label it with r. Diameter is the segment that passes throw the origin and […]

### Parallel and Perpendicular lines

Parallel and Perpendicular lines Two lines in a plane when are extended either meet or they don’t meet at all. Parallel linesTwo lines on the same plane are parallel if they never intersect with each other even if we extend them. The distance between them is always the same and they have exactly the same […]

### The Scalar and Vector Product

Scalar and Vector product There are two different ways in which vectors can be multiplied: the scalar and the vector product. Scalar Product Let’s suppose that we have two vectors $displaystyle overrightarrow{a}$and $displaystyle overrightarrow{b}$ shown below with the same direction and also the angle between them labeled ϴ. Definition: The scalar product of the vector […]

### Similar triangles

Similar triangles What are similar triangles? Similar triangles are triangles in which their corresponding angles are congruent and their corresponding sides are proportional. They are the same shape but not basically the same size. Three rules to prove if two triangles are similar 1. AA – the Angle-Angle rule states that if two corresponding angles of our two triangles are […]

### Pythagorean Theorem

Pythagorean Theorem Pythagorean theorem is used in a right angle triangle to calculate the sides of the triangle. When we are given two sides length in a right angle triangle we can find the missing side by using the Pythagorean theorem. Also to prove if a triangle is a right angle triangle. TIP! Don’t forget to read […]

### Congruent Triangles

Congruent triangles Two triangles are congruent if all their corresponding angles have the same measure and all their corresponding sides have the same length. Four rules of proving that two triangles are congruent Rule 1: The SSS rule: Side-Side-Side rule The side-side-side rule states that if the three sides of a triangle are equal to the three sides of the […]

### Triangles 