step 2 比较三角形和平行四边形.
area of a parallelogram
define: parallelogram a quadrilateral with two opposite and
law of sines and cosines, and areas of triangles
chapter5linearalgebra
Tips:Do Not Provide
Personal Loans: Go Easy On Your Finances
Finance, Finance, Finance, Foreign Exchange, Stocks, Currency Circle, Venture Capital, Bitcoin, ICO...