Semicircle
In geometry a semicircle is simply half a circle or a closed shape consisting of half a circle. It is a one-dimensional locus of points that forms half of a circle. The arc that...
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Diameter (of a circle)
This entry briefly looks at the diameter of a circle. The word “diameter” comes from Greek διάμετρος (diametros), “diameter of a circle”, from δια- (dia-), “across, through” + μέτρον (metron), “measure”. The diameter of...
Vertical Angles
In geometry vertical angles are formed when two straight lines intersect. They are opposite or vertically opposite to each other and non-adjacent. The angles are also said to share the same vertex. The most...
Area of an annulus
This entry briefly explores the area of an annulus. In mathematics, an annulus is a ring-shaped object, which contains a region bounded by two concentric circles. The area is simply the area of the...
Parallel lines
This quick wiki entry explores very briefly what parallel lines are. The word “Parallel” comes from the Greek word para allelois meaning “beside one another”. Lines are parallel if they lie in the same...
Adjacent angles
Let us look very briefly at Adjacent angles. In geometry adjacent angles are two angles that share a common side and a common vertex, but do not overlap. An example is show below. Above...
Full angle
This article explores very briefly what a full angle in geometry is. An angle is merely and angle whose measure is exactly 360°. This is where you make a full rotation or a full...
Reflex angle
How about reflex angles? This entry briefly looks at reflex angles. Reflex angles are angles greater than 180° and less than 360°. Below is an example of a reflex angle.
Straight angle
Let us look very briefly at straight angles. A straight angle in geometry is an angle that measures exactly 180°. The angle is flat and is just a single straight line. An example of...