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shape形状beeline直线curve曲线ellipse椭圆circle圆形semicircle半圆sector扇形triangle三角形a right triangle直角三角形isosceles triangle等腰三角形trapezoid梯形rhombus菱形rectangle长方形、矩形square正方形polygon多边形a regular polygon正多边形cone圆锥sphere球体pyramid三角锥体cube正方体cylinder圆柱体ring环形gear wheel齿轮形tube管状edge边side侧面A box has a top, a bottom, and four sides.corner角A square has four corners.angle角，角度obtuse angle钝角acute angle锐角right angle直角circumference圆周，周长center圆心diameter直径radius半径height高度depth深度width宽度
优质英语培训问答知识库
