equilateral triangle等边三角形
isosceles triangle等腰三角形
scalene triangle不等边三角形
right triangle 直角三角形
arm/lag 直角三角形的股
hypotenuse直角三角形斜边
median of a triangle三角形中线
diagonal 对角线
intersect相交
acute angle 锐角
right angle 直角
obstuse angle 钝角
straight angle 平角
adjacent angle 邻角
exterior angle外角
interior angle内角
complementary angles余角
supplementary angles补角
vertex angle顶角
vertical angle对顶角
angle bisector角平分线
rectangle 长方形, 矩形
trapezoid梯形
rhombus菱形
polygon多边形
regular polygon正多边形
parallelogram 平行四边形
quadrilateral四边形
square 正方形/平方square root 平方根
diagonal对角线
perimeter周长
segment线段
side 边长
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