99% of People Can't Name All These Shapes. Can You?
About This Quiz
One of the first things you learn as a toddler is that you can't fit a square peg in a round hole, no matter how hard you try. But as you grow up, you learn about more bewildering and complex shapes that exist in two or three dimensions and often have a bizarre set of physical properties, from a center of gravity in an unexpected location, to the ability to spin in one direction and not the other, to being technically innocent but thoroughly reminiscent of something very naughty indeed.
Some shapes derive their names from Greek or Latin origins, while others are named for the popular toy, tool or symbol that makes use of them. Some appear in everyday life, whether by design (literally) or simply baked into nature's lines in the form of sunflowers and golden ratios. Others are rarer, meaning you might not recall their names - mainly because you don't necessarily need to remember the name of a twelve-sided shape in order to get through your ordinary day. Either way, there was probably a time that you knew all of their correct names, even if just to get yourself through the SAT. So click on through and let's see how much you've retained!
A circle is a two-dimensional shape where the boundary of the circle is always the same distance from its center point. It basically is a line that meets itself. A circle consists of a number of properties, including a circumference, a radius, a diameter, and an area.
Decagons consist of 10 sides. They can be regular, where all sides are of equal length and all angles the same, or irregular, where sides are different lengths and angles inside the decagon vary. Note that whether the decagon is regular or irregular, the angles inside will add up to 1440 degrees.
Both regular and irregular octagons have eight sides. Unlike a regular octagon where the sides are all equal length, an irregular octagon features irregular sides and angles. The angles, however, will always add up to 1080 degrees.
A hexagon is a six-sided figure with equal sides. The angles inside are each 120 degrees, adding up to a total of 720 degrees. Of course, thats a perfect hexagon. Sides can be of different lengths and angles can change, but they will always add up to 720 degrees.
This two-dimensional shape has opposite sides of equal length. All four internal angle are 90 degrees, adding up to 360 degree in total. To find the area of a rectangle, all you need to do is multiply its width by its height.
Simply put, a convex polygon has all its interior angles less than 180 degrees. As soon as one of the angles goes above this number, it becomes a concave polygon. Note that all the vertices of the polygon point away from the center of this two-dimensional object.
An isosceles triangle has two sides of equal length with two equal, internal angles corresponding to those sides. The sides and the angles are sometimes called congruent, which basically is a fancy word for equal.
All quadrilaterals are polygons. When they are irregular, their sides are not the same, unlike a regular polygon where all sides and angles are congruent. The angles, however, will still add up to 360 degrees.
An obtuse triangle features an angle with more than 90 degrees. Only one side can be obtuse, otherwise the points of the triangle will never meet. If one angle is obtuse, the other two angles can only add up to 90 degrees.
A triangular-based pyramid is a three-dimensional figure that consists of a base and three triangular sides. All of these are generally the same size, although they don't need to be. If they are, the pyramid is called a tetrahedron.
An octahedron has eight sides. In its regular form, these are equilateral triangles. Essentially, this three-dimensional figure is two pyramids that are connected by their bases and stand 180 degrees to each other.
This quadrilateral has two sides that run parallel to each other. These are often referred to as the bases. The other two sides are not parallel and are called the legs. The distance between the two parallel sides is called the altitude.
A two-dimensional object with six sides, a regular hexagon has equal sides and internal angles, where an irregular hexagon will not. The internal angle is often more than 180 degrees, as two sides point back inside the hexagon.
An icosahedron has 20 faces. These take the form of equilateral triangles all joined together. This means a icosahedron has 30 sides and 12 vertices. If you look at a section of five of these equilateral triangles, you will see that they form a pentagon.
Nonagons are two-dimensional shapes with nine sides. With a regular nonagon, all sides and internal angles are equal. With an irregular nonagon, sides may not be equal. This produces angles that are not equal and exceed 180 degrees.
A two-dimensional shape that has two sides that are pairs. The adjacent sides are also equal in length. All internal angles will always add up to 360 degrees. Two angles where the pairs meet will always be the same .