Vertical Angles

Definition Vertical Angles are the angles opposite each other when two lines cross In this case, “Vertical” means they share the same corner point (Vertex), not the usual meaning of up-down. Example a° and b° are vertical angles. Vertical Angles are Congruent Angles The interesting thing here is that vertical angles are congruent angles: a°

Rhombus: Definition, Properties, Area, Perimeter, Examples

What Is Rhombus Geometry has some type of shape. Especially in plane geometry, one type of quadrilateral is rhombus. Specifically, rhombus is special type of parallelogram that has four sides that has same length. It is like square, but the angles in rhombus need not be right angles. Beside that it is also has diagonals

Prisms: Definition, Properties, Types, Surface Area, Volume, Examples

Prisms has many types depends on the base. There are many daily things in prisms such as aquarium, tent, tissue box, cupboard, etc.. Definition of Prisms Prisms is three-dimensional shape that is bordered by two bases and lateral planes. Number of lateral planes is same with number of edges of the base. Consequently, type of

Cube: Definition, Properties, Surface Area, Volume, Diagonal, And Examples

Cube is a special case of a prism. There are many things in daily life that is cube. Some of them are Rubik, dice, ice cube, aquarium, etc. Definition of Cube Cube is one of three-dimensional object. It has six squares as the sides (faces) so that it is also called hexahedron. Consequently, it has

Lines of Symmetry of Plane Shapes

The line of symmetry is the axis or imaginary line that passes through the center of the shape or object and divides it into identical halves. How to find a shape has a Line of Symmetry ? You can find a shape has a Line of Symmetry or not by folding it When the folded

Pyramid: Definitions, Types, Surface Area, Volume, and Examples

Definition of Pyramid Pyramid is one of polyhedron form that connecting polygonal as the base and a point that called apex/vertex. As consequences there are base (polygonal that is like triangle, square, etc.) and some triangle sides as lateral sides. Type of Pyramid Depends on the Base Number of triangle depends on what type polygonal

Triangles: Definition, Properties, Types, Area, Perimeter, Examples

Triangle has been used since long time ago in human life. There are many things in daily life that has triangle in shape for example ruler, hanger, slice of sandwich, front and back side of tent, surface of pyramid, etc.. Definition of Triangles Triangles is a two-dimension shape that bordered by three sides so that

Corresponding Angles: Theorem & Examples

Angle is formed by two rays that have a common end point. There are some types of angle. Here they are. Type of Angle In general, there are some kinds of angles: 1. Acute angle (less than 90°) Learn more about acute angle. 2. Right angle (90°) 3. Obtuse angle (more than 90° but less than

Reflex Angle

A Reflex Angle is more than 180° but less than 360° More Examples of Reflex Angle Which Angle? Remember to look carefully at which angle you are being asked to name. The reflex angle is the larger angle. It is more than 180° but less than 360° If you choose the smaller angle you might


Geometry is a branch of mathematics concerned with questions of shape, size, relative position of figures, & the properties of space. A mathematician who works in the field of geometry is called a geometer. There are some general concepts that are more or less fundamental to geometry. These include the concepts of points, lines, planes,