circle – 圆形semicircle – 半圆形isosceles triangle – 等腰三角
金字塔形 pyramid平行四边形 parallelogram梯形 trapezoid圆柱形
三角形计算器trianglecalculator软件v41安卓版
step 2 比较三角形和平行四边形.
得马住 圆形 circle;半圆 semi-circle;方形 square; 三角形 triangle
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