TriangleÂ is a plane figure with three straight sides and three angles. The three angles always add to 180Â°. The vertex is a corner of the triangle. Every triangle has three vertices. The interior angles of a triangle always add up to 180Â°. The exterior angles of a triangle always add up to 360.....

### Mathematic

### Classification of Triangles on the Basis of their Sides

TriangleÂ is a plane figure with three straight sides and three angles. The three angles always add to 180Â°. The vertex is a corner of the triangle. Every triangle has three vertices. The interior angles of a triangle always add up to 180Â°. The exterior angles of a triangle always add up to 360.....

### Medians of a Triangle

Medians of a Triangle A median of a triangle is a line segment joining a vertex to the midpoint of the opposite side. Triangle is a plane figure with three straight sides and three angles. The three angles always add to 180Â°. The vertex is a corner of the triangle. Every triangle has three verti.....

### Geometrical Property of Altitudes

Geometrical Property of Altitudes Sometimes the opposite side isnâ€™t quite long enough to draw an altitude, so we are allowed to extend it to make an altitude possible. This line containing the opposite side is called the extended base of the altitude. The intersection of the extended base and t.....

### Altitude of a Triangle

Altitude of a Triangle In geometry, an altitude of a triangle is a line segment through a vertex and perpendicular to a line containing the base. The definition of the altitude of a triangle is a line that extends from one vertex of a triangle perpendicular to the opposite side. Sometimes the opp.....

### Properties of Angles of a Triangle

Triangle is a plane figure with three straight sides and three angles. The three angles always add to 180Â°. The vertex is a corner of the triangle. Every triangle has three vertices. The interior angles of a triangle always add up to 180Â°. The exterior angles of a triangle always add up to 360Â.....

### Order of a Surd

Order of a Surd Definitions of surds: A root of a positive real quantity is called a surd if its value cannot be exactly determined. It is a number that canâ€™t be simplified to remove a square root (or cube root etc). For example, each of the quantities âˆš3, âˆ›7, âˆœ19, (16)^2/5 etc. is a [&he.....

### Induction Proof – Problems with Solutions

### Theorem of Three Perpendiculars

Theorem of Three Perpendiculars A line is said to be perpendicular to another line if the two lines intersect at a right angle. Explicitly, a first line is perpendicular to a second line if (1) the two lines meet, and (2) at the point of intersection the straight angle on one side of the first [&.....

### Converse of the Theorem on Parallel Lines and Plane

Converse of the theorem on parallel lines and plane: Theorem: If two straight lines are parallel and if one of them is perpendicular to a plane, then the other is also perpendicular to the same plane. When lines and planes are perpendicular and parallel, they have some interesting properties. Lin.....

### Theorem on Parallel Lines and Plane

Theorem on Parallel Lines and Plane Theorem: If two straight lines are parallel and if one of them is perpendicular to a plane, then the other is also perpendicular to the same plane. When lines and planes are perpendicular and parallel, they have some interesting properties. Lines and planes are.....

### Theorem on Co-planar

Theorem on Co-planar A set of points, lines, line segments, rays or any other geometrical shapes that lie on the same plane are said to be Coplanar. In geometry, a set of points in space are coplanar if there exists a geometric plane that contains them all. For example, three points are always co.....