It depends on what information you have about the shape.
Shapes with 12 to 20 sides are named as follows: a 12-sided shape is called a dodecagon, a 13-sided shape is a triskaidecagon, a 14-sided shape is a tetradecagon, a 15-sided shape is a pentadecagon, a 16-sided shape is a hexadecagon, a 17-sided shape is a heptadecagon, an 18-sided shape is an octadecagon, a 19-sided shape is a nonadecagon, and a 20-sided shape is an icosagon.
A one sided shape
A=(5t2 tan(54o) )/ 4
Any of these shapes is practically circular. A 20-sided shape is an icosagon. a 50-sided shape is a pentacontagon (aka pentecontagon). A 100-sided shape is a hectogon (aka hecatontagon). A 1000-sided shape is a chiliagon.
A 17 sided polygon (called a heptadecagon).
heptadecagon is a 17 sided 2d shape
A 17-gon
heptadecadon
Shapes with 12 to 20 sides are named as follows: a 12-sided shape is called a dodecagon, a 13-sided shape is a triskaidecagon, a 14-sided shape is a tetradecagon, a 15-sided shape is a pentadecagon, a 16-sided shape is a hexadecagon, a 17-sided shape is a heptadecagon, an 18-sided shape is an octadecagon, a 19-sided shape is a nonadecagon, and a 20-sided shape is an icosagon.
Heptadecagon or a Heptakaidecagon
That sounds like either a Triangle (three sided area) or a Trapezoid (four sided area).
The interior is a two-dimensional, 7-sided area.
17
Assuming it is regular, the total degrees of an n-sided polygon = 180(n-2) = 2700. 2700/17 = 158.23 degrees
First of all to correct your English grammar. When a noun begins with a vowel , then the indefinite article is 'an', NOT 'a'. Also, the second 'is' is a verb , and should be a conjunction. So the question should read, ' What is an area in maths?' To answer you question. An Area is the region covered by a 2-dimensional drawing/figure/polygon.
The name for a 57 sided shape is derived by combining the name for a 50 sided shape with the name for a 7 sided shape. A 57 sided shape is called a pentacontaheptagon.
The area for a four sided shape is length * width = area.We have the area at 17. We know that length = width. We designated length and width as x. Our new equation isx * x = 17, or x2 = 17.Now we have to isolate x.x = sqrt(17).Solving for x, we get x = 4.123.