quadrilateral GMAT专八

1.quadrilateral control by foreign powers

受四方面的外国势力的控制

2.A kite is a quadrilateral with one line of symmetry.

风筝是个有一条对称线的四边形。

3.According to the principles of infinitesimal calculus,a new method on how to ratiocinate the arbitrary quadrilaterals area was put forward.

利用微积分原任意四边形面积公式推证的一种新方法。