Concave polygon A concave polygon has one or more angles larger than 180º. LicenseCC-BY-SA, GeoGebra Terms of Use […]
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Convex polygon
Convex polygon A convex polygon is a polygon, no angles larged than 180°. Examples: a convex polygon: a regular pentagon. convex pentagon convex hexagon LicenseCC-BY-SA, GeoGebra Terms of Use […]
Regular Polygon
Regular polygon Regular polygons have all sides equal and all angles equal. Angle formulas for regular polygons n – the number of sides Area and perimeter of regular Polygons Area = (n × a × apothem) / 2 r – apothem is the radius of the inner circle […]
Vertical angles, vertically opposite angles
Vertical angles, vertically opposite angles Vertical angles are the angles that lie opposite to each other when two lines intersect. Two vertical angles always share a common vertex. However, they never share a common side (arm). “Vertical” in this case means they share the same Vertex (corner point), not the usual meaning of up-down. Example: ∠AOD and ∠BOC […]
Vertical
Vertical A vertical line is the one that we draw from top to bottom. On a table, the legs of the table are vertical lines. In the 2-dimension case, as mentioned already, the usual designation of the vertical coincides with the y-axis in coordinate geometry. https://en.wikipedia.org/wiki/File:Mystery_of_the_horizontal_y-axis.PNG […]
Vertex, vertices
Vertex, vertices A vertex is a point where two straight lines or rays meet to form an angle, the edges of a solid figure meet and the corners of polygons and polyhedra are vertices. Vertices are found in angles, which are measured in degrees. Pentagon Triangular Pyramid Rectangular […]
Perpendicular
Perpendicular Perpendicular lines are straight lines that form the right angle (90° angle) with each other. See some examples of perpendicular lines, below: […]
Cylinder
Cylinder A cylinder is a 3D solid shape that consists of two identical and parallel bases linked by a curved surface. These bases are like circular disks, two congruent circular or elliptical bases Surface area 2 · The area of the base + base circumference · height2πr2 + 2πrh Volume The area of the […]
Cubic metre
Cubic metre The cubic metre or cubic meter (in American English) is the unit of volume in the International System of Units (SI). It is the volume of a cube with edges one metre in length. One cubic metre is any volume equivalent to the volume formed by a cube measuring 1m by 1m by 1m. Cubic metre symbol is m3. m3 […]
Cubic centimetre
Cubic centimetre A Cubic Centimetre (abbreviated cm3) is a cube that is 1 centimeter on each side. So it is one-thousandth of a liter, or one-millionth of a cubic meter. The cubic centimetre is a unit of volume in the International System of Units (SI). 1 cm x 1cm x 1cm […]
