三角形内切圆
inscribed circle of a triangle
小测地三角形的角盈
angular excess of a small geodesic triangle
等角三角形命题
equiangular triangleproposition
等腰直角三角形波导
isosceles-right triangular waveguide
等腰直角三角形网
right-triangle irregular network
复数的三角形式
trigonometrical form of complex number