十边形 Decagon

（重定向自Regular Decagon）

十边形是几何学上所有有10条边和10只角的多边形。

正十边形是十边等长、十角等大的多边形。内角为144°。若边长为 $a$ ，面积 $A = \frac{10}{4}a^2 \cot \frac{\pi}{10} \simeq 7.6942 a^2.$ 。尺规作图可先在圆形内制作正五边形，再将各边二等分线延伸至圆周以完成正十边形的顶点。

单词	Regular Decagon
释义	Regular Decagon 中文百科十边形 Decagon （重定向自Regular Decagon）十边形是几何学上所有有10条边和10只角的多边形。正十边形是十边等长、十角等大的多边形。内角为144°。若边长为 $a$ ，面积 $A = \frac{10}{4}a^2 \cot \frac{\pi}{10} \simeq 7.6942 a^2.$ 。尺规作图可先在圆形内制作正五边形，再将各边二等分线延伸至圆周以完成正十边形的顶点。英语百科 Decagon 十边形（重定向自Regular Decagon） In geometry, a decagon is a ten-sided polygon or 10-gon. A regular decagon has all sides of equal length and each internal angle will always be equal to 144°. Its Schläfli symbol is {10} and can also be constructed as a truncated pentagon, t{5}, a quasiregular decagon alternating two types of edges.
随便看	Astrocytoma,Gemistocytic Astrocytoma,Grade I Astrocytoma,Grade II Astrocytoma,Grade III Astrocytoma,Grade IV Astrocytoma,Intracranial Astrocytoma,Juvenile Pilocytic Astrocytoma,Malignant,Optic Nerve astrocytoma pilocytic Astrocytoma,Pilocytic astrocytoma piloid astrocytoma protoplasmaticum Astrocytoma,Protoplasmic Astrocytomas,Adult Subependymal Astrocytomas,Anaplastic Astrocytomas,Cerebral Astrocytomas,Childhood Cerebral Astrocytomas,Fibrillary Astrocytomas,Gemistocytic Astrocytomas,Grade I Astrocytomas,Grade II Astrocytomas,Grade III Astrocytomas,Grade IV Astrocytomas,Intracranial Astrocytomas,Juvenile Pilocytic

Regular Decagon